Mexico City officials said Tuesday they will tighten rules for children leaving government schools on their own after a 7-year-old girl was found murdered over the weekend.

In Mexico City, even grade-school students often simply walk out of school after classes to meet parents waiting on the sidewalks, but there have been few controls to ensure someone is there to meet them.

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Women protest against gender violence outside the National Palace that includes the presidential office and residence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Mexico City officials said Tuesday they will tighten rules for children leaving government schools on their own after a 7-year-old girl was found murdered over the weekend.

Auxiliary police stand guard against the facade of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Her body was found wrapped in a bag and abandoned in a rural area on Saturday. By law, prosecutors don't give the full name of victims.

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Mexico City Mayor Claudia Sheinbaum said authorities would now issue amber alerts and start searching for children as soon as they are reported missing by a relative or teacher. Authorities lost a full day in the search for Fatima because they waited for a formal missing-person case file to be opened.

A protester holds up a placard that shows a drawing of woman lying in a pool of blood with the Spanish word for justice, during a demonstration against gender violence, outside the National Palace, that includes the presidential residence and office,  in Mexico City, Tuesday, Feb. 18, 2020. The protest comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

The lower house of Mexico's Congress held a moment of silence Tuesday for Fatima, whose case has sparked outrage.

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

His daughter was initially told that authorities couldn't begin searching for 72 hours after her disappearance, he said. However, the prosecutors office said an amber alert was issued the same day that relatives reported her missing.

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

The man, who has been arrested and purportedly confessed to killing Escamilla with a knife, mutilated her body and flushed part of her corpse into the sewer.

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A man prepares a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

A man prepares a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

A woman places a candle in a window ledge of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman places a candle in a window ledge of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A spray-painted message that reads in Spanish: "We want us alive" defaces the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A spray-painted message that reads in Spanish: "We want us alive" defaces the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman holds up a message handwritten on the inside of a cereal box that reads in Spanish: "I fight for Ingrid, Fatima, and the missing women" during a protest against gender violence, outside the National Palace, that includes the presidential residence and office,  in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman holds up a message handwritten on the inside of a cereal box that reads in Spanish: "I fight for Ingrid, Fatima, and the missing women" during a protest against gender violence, outside the National Palace, that includes the presidential residence and office, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

That is apparently what happened to Fatima, who was seen on video leaving her school on Feb. 11 with an unidentified woman. Mexico City prosecutor Ernestina Godoy said the girl “recognized her, and so they let her go with her.”

Women protest against gender violence outside the National Palace that includes the presidential office and residence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Women protest against gender violence outside the National Palace that includes the presidential office and residence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Her body was found wrapped in a bag and abandoned in a rural area on Saturday. By law, prosecutors don't give the full name of victims.

Humberto Fernandez, the head of the city's school system, said there is already a little-used rule requiring parents or designated person to show up within 20 minutes after classes, or their kids will be taken to a prosecutors' office.

Fernandez said that rule was “very rarely”enforced because children were accepted at only one downtown prosecutors'office in the city of 9 million. Fernandez said all prosecutors'offices in the city's 16 boroughs will recieve children, and police patrol cars will be obliged to help school officials take them there.

Auxiliary police stand guard against the facade of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Auxiliary police stand guard against the facade of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Mexico City Mayor Claudia Sheinbaum said authorities would now issue amber alerts and start searching for children as soon as they are reported missing by a relative or teacher. Authorities lost a full day in the search for Fatima because they waited for a formal missing-person case file to be opened.

Family and neighbors packed a street in the southern borough of Tlahuac on Tuesday for a Mass underneath a massive yellow tarp strung from roof to roof.

The priest leading the service asked God to watch over “our sister” and called for a “culture of prevention.”

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

The lower house of Mexico's Congress held a moment of silence Tuesday for Fatima, whose case has sparked outrage.

The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction has been shown on television.

Guillermo Anton Godínez, the girl's grandfather, said Monday that his daughter, the girl's mother, arrived at the school 15 or 20 minutes after the woman led the girl away. He added that his granddaughter had left the school wearing her uniform, but the woman had put a green shirt and pants on her.

A protester holds up a placard that shows a drawing of woman lying in a pool of blood with the Spanish word for justice, during a demonstration against gender violence, outside the National Palace, that includes the presidential residence and office,  in Mexico City, Tuesday, Feb. 18, 2020. The protest comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A protester holds up a placard that shows a drawing of woman lying in a pool of blood with the Spanish word for justice, during a demonstration against gender violence, outside the National Palace, that includes the presidential residence and office, in Mexico City, Tuesday, Feb. 18, 2020. The protest comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

His daughter was initially told that authorities couldn't begin searching for 72 hours after her disappearance, he said. However, the prosecutors office said an amber alert was issued the same day that relatives reported her missing.

Prosecutors' spokesman Ulises Lara offered a $100,000 reward for information on the person who picked her up when she left school.

The abduction and killing of the child came just days after Ingrid Escamilla, a young Mexico City resident, was allegedly murdered by a boyfriend.

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

The man, who has been arrested and purportedly confessed to killing Escamilla with a knife, mutilated her body and flushed part of her corpse into the sewer.

The Mexican capital has seen a series of angry demonstrations over killings of women over the past few months, including several in which protesters have vandalized major monuments and buildings.

The killings have proved a politically difficult issue for President Andrés Manuel López Obrador, who who has sometimes complained that protests over the killings were an attempt to distract attention from his social programs.

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

Men prepare a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

Masked, female protesters deface the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A man prepares a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

A man prepares a grave for 7-year-old Fatima who was abducted from the entrance of her primary school and later murdered, in Mexico City, Tuesday, Feb. 18, 2020. Her body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. The cause of death has not been released. Five people have been questioned in the case, and video footage of her abduction exists. (AP PhotoMarco Ugarte)

A woman places a candle in a window ledge of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman places a candle in a window ledge of the National Palace, that includes the presidential residence and office, which was defaced during a demonstration against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A spray-painted message that reads in Spanish: "We want us alive" defaces the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A spray-painted message that reads in Spanish: "We want us alive" defaces the facade of the National Palace, that includes the presidential residence and office, during a protest against gender violence, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman holds up a message handwritten on the inside of a cereal box that reads in Spanish: "I fight for Ingrid, Fatima, and the missing women" during a protest against gender violence, outside the National Palace, that includes the presidential residence and office,  in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)

A woman holds up a message handwritten on the inside of a cereal box that reads in Spanish: "I fight for Ingrid, Fatima, and the missing women" during a protest against gender violence, outside the National Palace, that includes the presidential residence and office, in Mexico City, Tuesday, Feb. 18, 2020. The demonstration comes after last week's vicious murder of a 7-year-old girl. Fatima's body was found wrapped in a bag and abandoned in a rural area on Saturday and was identified by genetic testing. (AP PhotoEduardo Verdugo)