Authorities are investigating online threats against schools near the Los Angeles-area high school where a 16-year-old boy shot and killed two classmates and wounded three others.

Sheriff’s officials said Sunday that investigators have not found any of the threats made on social media to be credible.

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This undated photo provided by the Muehlberger family shows Gracie Anne Muehlberger, 15. She is one of two students who died when Nathaniel Tennosuke Berhow opened fire at Saugus High School in Santa Clarita, Calif., Thursday, Nov. 14, 2019. Berhow, 16, planned the attack at the Southern California high school, but investigators were so far unable to find out why he brought a gun to campus and opened fire, authorities said Friday. (Muehlberger family via AP)

Authorities are investigating online threats against schools near the Los Angeles-area high school where a 16-year-old boy shot and killed two classmates and wounded three others.

Emily Boyle, a senior at Valencia High School brings flowers at a memorial near Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. Officials held a press conference Friday outside of the police station Santa Clarita. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

A wounded 14-year-old girl was released from the hospital Friday. A 15-year-old girl remains hospitalized in good condition.

A Los Angeles Sheriff Sheriff's vehicle patrols the surroundings of the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. Investigators said Friday they have yet to find a diary, manifesto or note that would explain why a boy killed two students outside the Southern California high school on his 16th birthday. (AP PhotoDamian Dovarganes)

A Los Angeles Sheriff Sheriff's vehicle patrols the surroundings of the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. Investigators said Friday they have yet to find a diary, manifesto or note that would explain why a boy killed two students outside the Southern California high school on his 16th birthday. (AP PhotoDamian Dovarganes)

Deputy James Callahan, at podium, takes questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. Callahan works as a school resource officer at Saugus High School, was on the scene in the aftermath of the shooting, (AP PhotoDamian Dovarganes)

Deputy James Callahan, at podium, takes questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. Callahan works as a school resource officer at Saugus High School, was on the scene in the aftermath of the shooting, (AP PhotoDamian Dovarganes)

Santa Clarita Mayor Marsha McLean, far left, Los Angeles Sheriff Sheriff Alex Villanueva, left, Detective Daniel Finn, at podium, and Deputy James Callahan, far right, take questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Santa Clarita Mayor Marsha McLean, far left, Los Angeles Sheriff Sheriff Alex Villanueva, left, Detective Daniel Finn, at podium, and Deputy James Callahan, far right, take questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Doctors at Providence Holy Cross Hospital in Mission Hills tell reporters they treated a 15-year-old girl and a 14-year-old girl after Thursday's shooting at Saugus High School in Santa Clarita, during a news conference Friday, Nov. 15, 2019 in Los Angeles.  The suspected gunman shot five students, seemingly at random, and then shot himself in the head and remains in critical condition Friday.  (AP PhotoDamian Dovarganes)

Doctors at Providence Holy Cross Hospital in Mission Hills tell reporters they treated a 15-year-old girl and a 14-year-old girl after Thursday's shooting at Saugus High School in Santa Clarita, during a news conference Friday, Nov. 15, 2019 in Los Angeles. The suspected gunman shot five students, seemingly at random, and then shot himself in the head and remains in critical condition Friday. (AP PhotoDamian Dovarganes)

Hannah Schooping-Gutierrez, center, a student at Saugus High School, is comforted by her boyfriend Declan Sheridan, at right, a student at nearby Valencia High School during a vigil at Central Park in the aftermath of a shooting at Saugus Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Hannah Schooping-Gutierrez, center, a student at Saugus High School, is comforted by her boyfriend Declan Sheridan, at right, a student at nearby Valencia High School during a vigil at Central Park in the aftermath of a shooting at Saugus Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Students embrace during a vigil at Central Park in the aftermath of a shooting at Saugus High School Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Students embrace during a vigil at Central Park in the aftermath of a shooting at Saugus High School Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

People hug each other during a vigil for the Saugus High School shooting victims at Central Park, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (Hans GutknechtThe Orange County RegisterSCNG via AP)

People hug each other during a vigil for the Saugus High School shooting victims at Central Park, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (Hans GutknechtThe Orange County RegisterSCNG via AP)

Jessica Dumont, a former student at Saugus High School, places balloons on a makeshift memorial at Central Park in honor of the victims of a shooting at the high school Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Jessica Dumont, a former student at Saugus High School, places balloons on a makeshift memorial at Central Park in honor of the victims of a shooting at the high school Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Members of Saugus High School's Air Force JUNIOR ROTC unit hold a moment of silence in memory of the victims of a shooting at the school earlier in the day Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Members of Saugus High School's Air Force JUNIOR ROTC unit hold a moment of silence in memory of the victims of a shooting at the school earlier in the day Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Flowers are placed in front of Saugus High School in the aftermath of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Flowers are placed in front of Saugus High School in the aftermath of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Ella Cabigting is embraced by her father Emerson as they reunite following a shooting at Saugus High School that injured several people, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoRingo H.W. Chiu)

Ella Cabigting is embraced by her father Emerson as they reunite following a shooting at Saugus High School that injured several people, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoRingo H.W. Chiu)

Emergency personnel remove an injured person following a shooting at Saugus High School, Thursday, Nov. 14, 2015 in Santa Clarita, Calif. (David CraneThe Orange County Register via AP)

Emergency personnel remove an injured person following a shooting at Saugus High School, Thursday, Nov. 14, 2015 in Santa Clarita, Calif. (David CraneThe Orange County Register via AP)

Medical personnel load an injured person into an ambulance outside Saugus High School in Santa Clarita, Calif., after a student gunman opened fire at the school on Thursday, Nov. 14, 2015. (Rick McClure via AP)

Medical personnel load an injured person into an ambulance outside Saugus High School in Santa Clarita, Calif., after a student gunman opened fire at the school on Thursday, Nov. 14, 2015. (Rick McClure via AP)

Students are escorted out of Saugus High School after reports of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Students are escorted out of Saugus High School after reports of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Student Sayla David, 12, holds thank you signs for first responders outside the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

Student Sayla David, 12, holds thank you signs for first responders outside the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

Los Angeles Sheriff Sheriff Alex Villanueva expresses his condolences for the victims of the shooting at Saugus High School at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Los Angeles Sheriff Sheriff Alex Villanueva expresses his condolences for the victims of the shooting at Saugus High School at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Meanwhile detectives are searching for a motive for the killings carried out Thursday by Nathaniel Berhow at Saugus High School in Santa Clarita. The teen shot himself and later died. Authorities say Berhow didn’t appear to be linked to any ideology.

This undated photo provided by the Muehlberger family shows Gracie Anne Muehlberger, 15. She is one of two students who died when Nathaniel Tennosuke Berhow opened fire at Saugus High School in Santa Clarita, Calif., Thursday, Nov. 14, 2019. Berhow, 16, planned the attack at the Southern California high school, but investigators were so far unable to find out why he brought a gun to campus and opened fire, authorities said Friday. (Muehlberger family via AP)

This undated photo provided by the Muehlberger family shows Gracie Anne Muehlberger, 15. She is one of two students who died when Nathaniel Tennosuke Berhow opened fire at Saugus High School in Santa Clarita, Calif., Thursday, Nov. 14, 2019. Berhow, 16, planned the attack at the Southern California high school, but investigators were so far unable to find out why he brought a gun to campus and opened fire, authorities said Friday. (Muehlberger family via AP)

A wounded 14-year-old girl was released from the hospital Friday. A 15-year-old girl remains hospitalized in good condition.

Officials didn’t say how many recent threats are being investigated. Additional law enforcement will be posted at schools Monday.

Emily Boyle, a senior at Valencia High School brings flowers at a memorial near Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. Officials held a press conference Friday outside of the police station Santa Clarita. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

Emily Boyle, a senior at Valencia High School brings flowers at a memorial near Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. Officials held a press conference Friday outside of the police station Santa Clarita. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

A Los Angeles Sheriff Sheriff's vehicle patrols the surroundings of the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. Investigators said Friday they have yet to find a diary, manifesto or note that would explain why a boy killed two students outside the Southern California high school on his 16th birthday. (AP PhotoDamian Dovarganes)

A Los Angeles Sheriff Sheriff's vehicle patrols the surroundings of the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. Investigators said Friday they have yet to find a diary, manifesto or note that would explain why a boy killed two students outside the Southern California high school on his 16th birthday. (AP PhotoDamian Dovarganes)

Deputy James Callahan, at podium, takes questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. Callahan works as a school resource officer at Saugus High School, was on the scene in the aftermath of the shooting, (AP PhotoDamian Dovarganes)

Deputy James Callahan, at podium, takes questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. Callahan works as a school resource officer at Saugus High School, was on the scene in the aftermath of the shooting, (AP PhotoDamian Dovarganes)

Santa Clarita Mayor Marsha McLean, far left, Los Angeles Sheriff Sheriff Alex Villanueva, left, Detective Daniel Finn, at podium, and Deputy James Callahan, far right, take questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Santa Clarita Mayor Marsha McLean, far left, Los Angeles Sheriff Sheriff Alex Villanueva, left, Detective Daniel Finn, at podium, and Deputy James Callahan, far right, take questions from the media at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Doctors at Providence Holy Cross Hospital in Mission Hills tell reporters they treated a 15-year-old girl and a 14-year-old girl after Thursday's shooting at Saugus High School in Santa Clarita, during a news conference Friday, Nov. 15, 2019 in Los Angeles.  The suspected gunman shot five students, seemingly at random, and then shot himself in the head and remains in critical condition Friday.  (AP PhotoDamian Dovarganes)

Doctors at Providence Holy Cross Hospital in Mission Hills tell reporters they treated a 15-year-old girl and a 14-year-old girl after Thursday's shooting at Saugus High School in Santa Clarita, during a news conference Friday, Nov. 15, 2019 in Los Angeles. The suspected gunman shot five students, seemingly at random, and then shot himself in the head and remains in critical condition Friday. (AP PhotoDamian Dovarganes)

Hannah Schooping-Gutierrez, center, a student at Saugus High School, is comforted by her boyfriend Declan Sheridan, at right, a student at nearby Valencia High School during a vigil at Central Park in the aftermath of a shooting at Saugus Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Hannah Schooping-Gutierrez, center, a student at Saugus High School, is comforted by her boyfriend Declan Sheridan, at right, a student at nearby Valencia High School during a vigil at Central Park in the aftermath of a shooting at Saugus Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Students embrace during a vigil at Central Park in the aftermath of a shooting at Saugus High School Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Students embrace during a vigil at Central Park in the aftermath of a shooting at Saugus High School Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

People hug each other during a vigil for the Saugus High School shooting victims at Central Park, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (Hans GutknechtThe Orange County RegisterSCNG via AP)

People hug each other during a vigil for the Saugus High School shooting victims at Central Park, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (Hans GutknechtThe Orange County RegisterSCNG via AP)

Jessica Dumont, a former student at Saugus High School, places balloons on a makeshift memorial at Central Park in honor of the victims of a shooting at the high school Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Jessica Dumont, a former student at Saugus High School, places balloons on a makeshift memorial at Central Park in honor of the victims of a shooting at the high school Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot several classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Members of Saugus High School's Air Force JUNIOR ROTC unit hold a moment of silence in memory of the victims of a shooting at the school earlier in the day Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Members of Saugus High School's Air Force JUNIOR ROTC unit hold a moment of silence in memory of the victims of a shooting at the school earlier in the day Thursday, Nov. 14, 2019, in Santa Clarita, Calif. Los Angeles County sheriff’s officials say a 16-year-old student shot five classmates and then himself in a quad area of Saugus High School Thursday morning. (AP PhotoMarcio Jose Sanchez)

Flowers are placed in front of Saugus High School in the aftermath of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Flowers are placed in front of Saugus High School in the aftermath of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Ella Cabigting is embraced by her father Emerson as they reunite following a shooting at Saugus High School that injured several people, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoRingo H.W. Chiu)

Ella Cabigting is embraced by her father Emerson as they reunite following a shooting at Saugus High School that injured several people, Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoRingo H.W. Chiu)

Emergency personnel remove an injured person following a shooting at Saugus High School, Thursday, Nov. 14, 2015 in Santa Clarita, Calif. (David CraneThe Orange County Register via AP)

Emergency personnel remove an injured person following a shooting at Saugus High School, Thursday, Nov. 14, 2015 in Santa Clarita, Calif. (David CraneThe Orange County Register via AP)

Medical personnel load an injured person into an ambulance outside Saugus High School in Santa Clarita, Calif., after a student gunman opened fire at the school on Thursday, Nov. 14, 2015. (Rick McClure via AP)

Medical personnel load an injured person into an ambulance outside Saugus High School in Santa Clarita, Calif., after a student gunman opened fire at the school on Thursday, Nov. 14, 2015. (Rick McClure via AP)

Students are escorted out of Saugus High School after reports of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Students are escorted out of Saugus High School after reports of a shooting on Thursday, Nov. 14, 2019, in Santa Clarita, Calif. (AP PhotoMarcio Jose Sanchez)

Student Sayla David, 12, holds thank you signs for first responders outside the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

Student Sayla David, 12, holds thank you signs for first responders outside the Saugus High School in Santa Clarita, Calif., Friday, Nov. 15, 2019. A homicide official says that investigators did not find a diary, manifesto or note belonging to the boy who killed two people outside his Southern California high school on his 16th birthday. No motive or rationale has been established yet in the Thursday morning shooting at Saugus High School in the Los Angeles suburb of Santa Clarita. (AP PhotoDamian Dovarganes)

Los Angeles Sheriff Sheriff Alex Villanueva expresses his condolences for the victims of the shooting at Saugus High School at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)

Los Angeles Sheriff Sheriff Alex Villanueva expresses his condolences for the victims of the shooting at Saugus High School at a news conference at the station Santa Clarita, Calif., Friday, Nov. 15, 2019. (AP PhotoDamian Dovarganes)