Photos show farmers' protests during the EU Summit in Belgium

BRUSSELS (AP) — European farmers demonstrated outside the EU summit in Brussels, blocking roads with tractors, clashing with police and setting tires on fire. At the world leaders summit itself, tensions centered on a plan to use frozen Russian assets to aid Ukraine for the next two years.

This is a photo gallery curated by AP photo editors.

A man looks through a broken window of a visitors center that was damaged after a demonstration of European farmers at the European Parliament in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Police try to disperse protestors during a demonstration of European farmers near the European Parliament in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Police carry away a man who was injured in clashes during a demonstration of European farmers near the European Parliament in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Police try to disperse protestors during a demonstration of European farmers near the European Parliament in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Two men walk in front of tractors during a demonstration of European farmers outside the EU Summit meeting in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Ukraine's President Volodymyr Zelenskyy addresses a media conference during the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Omar Havana)

Tractors of European farmers block a main boulevard during a demonstration outside a gathering of European leaders at the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

A protestor sits on a curb injured during a demonstration of European farmers near the European Parliament in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

European Union foreign policy chief Kaja Kallas speaks with the media as she arrives for the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Omar Havana)

A protestor picks up a burning tire during a demonstration of European farmers outside the EU Summit meeting in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Two men walk by a wooden coffin placed on a statue base during a demonstration by European farmers outside the EU Summit meeting in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

French President Emmanuel Macron speaks with the media as he arrives for the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Geert Vanden Wijngaert)

A fire burns in a barrel as European farmers block a road with their tractors during a demonstration outside the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

Belgium's Prime Minister Bart De Wever, center, speaks with from left, Cypriot President Nikos Christodoulides, Netherland's Prime Minister Dick Schoof, Luxembourg's Prime Minister Luc Frieden and Poland's Prime Minister Donald Tusk during a round table meeting at the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Geert Vanden Wijngaert)

Police guard a barrier as farmers drive their tractors to block a main boulevard during a demonstration outside a gathering of European leaders at the EU Summit in Brussels, Thursday, Dec. 18, 2025. (AP Photo/Marius Burgelman)

PROVIDENCE, R.I. (AP) — The investigation into the Brown University mass shootingshifted Thursday when authorities said they were looking into a connection between the shooting and an attack two days later near Boston that killed a professor from Massachusetts Institute of Technology.

The attacker at Brown killed two students and wounded nine others on Saturday. Some 50 miles (80 kilometers) away MIT professor Nuno F.G. Loureiro was killed Monday night in his home in the Boston suburb of Brookline.

Here are some answers to questions about the attacks and investigations:

Authorities have not divulged much information yet. Three people familiar with the matter who were not authorized to discuss an ongoing investigation and spoke on condition of anonymity confirmed the shift in investigation. Two of the people said investigators had identified a person of interest in the shootings and were actively seeking that individual.

The FBI previously said it knew of no links between the cases.

It’s been nearly a week since the shooting at Brown. There have been other high-profile attacks in which it took days or longer to make an arrest, including in the brazen New York City sidewalk killing of UnitedHealthcare’s CEO last year, which took five days.

Frustration is mounting in Providence that the person behind the Brown attack managed to get away and that a clear image of their face has yet to emerge.

Authorities have released several security videos of a person they think might have carried out the Brown attack. They show the individual standing, walking and even running along the streets, but their face is masked or turned away in all of them.

The state attorney general said the wing of the engineering building where the attack happened has few “if any” cameras, and investigators believe the shooter entered and left through a door that faces a residential street bordering campus. The building is on the edge of campus, which might explain why the cameras Brown does have didn’t capture footage of the person.

Loureiro, 47, who was married, joined MIT in 2016 and was named last year to lead the school’s Plasma Science and Fusion Center, where he worked to advance clean energy technology and other research. The center, one of MIT’s largest labs, had more than 250 people working across seven buildings when he took the helm. He was a professor of physics and nuclear science and engineering.

Authorities have not speculated on why he was killed and no suspect is in custody.

We still don't know. Although police said this week that they believe Brown was purposefully targeted and that the videos suggest the masked person had been casing the building, no one has taken credit for the attack and investigators apparently still hadn't identified a suspect as of Thursday.

The investigation was taking place as Brown was sending out early decision notifications.

Police say they still don't know. The finals study session was for a “Principles of Economics” course that attracts hundreds of students each semester, but police are still tracking down how many may have been in the room.

The two students who were killed and the nine others injured were studying for a final in a first-floor classroom in an older section of the engineering building when the shooter walked in and opened fire.

Those killed were 19-year-old sophomore Ella Cook and 18-year-old freshman MukhammadAziz Umurzokov. Cook, whose funeral is Monday, was active in her Alabama church and served as vice president of the Brown College Republicans. Umurzokov’s family immigrated to the U.S. from Uzbekistan when he was a child, and he aspired to be a doctor.

As for the wounded, one remained hospitalized in critical condition and five were in stable condition as of Wednesday, officials said. The other three were discharged.

Whittle reported from Portland, Maine. Contributing were Associated Press reporters Kimberlee Kruesi, Amanda Swinhart, Robert F. Bukaty, Matt O'Brien and Jennifer McDermott in Providence; Michael Casey in Boston; Heather Hollingsworth in Mission, Kansas; Kathy McCormack and Holly Ramer in Concord, New Hampshire; Christopher Weber in Los Angeles; and Alanna Durkin Richer, Mike Balsamo and Eric Tucker in Washington.

This combo image made with photos provided by the FBI and the Providence, Rhode Island, Police Department shows a person of interest in the shooting that occurred at Brown University in Providence, R.I., Saturday, Dec. 13, 2025. (FBI/Providence Police Department via AP)

A memorial of flowers and signs lay outside the Barus and Holley engineering building at Brown University, on Hope Street in Providence, R.I., on Tuesday, Dec 16, 2025. (AP Photo/Matt OBrien)

A Brown University student leaves campus, Tuesday, Dec. 16, 2025, after all classes, exams and papers were canceled for the rest of the Fall 2025 semester following the school shooting, in Providence, R.I. (AP Photo/Robert F. Bukaty)