Authorities in Brookline, Massachusetts, have ramped up efforts to locate the individual responsible for the fatal shooting of MIT professor Nuno F.G. Loureiro, which occurred earlier this week. The intensified search follows the tragic event on Monday night when Loureiro, a renowned physicist and expert in fusion science, was shot at his residence in Brookline. The 47-year-old succumbed to his injuries on Tuesday at a local hospital, according to a statement from the Norfolk District Attorney’s Office.

The District Attorney’s Office confirmed on Wednesday afternoon that the investigation remains “active and ongoing.” Despite the intensified efforts, no suspects have been apprehended at this time.

The murder investigation adds to the region’s growing concerns over recent violent incidents, including an unresolved shooting at Brown University in Providence, Rhode Island—about 50 miles away. In that incident, which took place on Saturday, two students were killed and nine others injured. As of Tuesday, authorities had yet to identify the shooter involved in the Brown University case.

The FBI has stated that, at present, there is no evidence linking the two separate incidents.

The FBI on Tuesday said it knew of no connection between the crimes.

Dozens of people gathered outside Louriero’s building Tuesday night, many with candles in hand, to honor the professor’s life and support his family. Neighbors received paper notices attached to their doors with tape to place candles in their windows in Louriero’s honor. Some people cried and held each other, but most attendees were silent, their breath visible in the bracing cold. A few children rode scooters from their nearby homes to the gathering.

The killing happened when most MIT students were on winter break, and more than a dozen of them on the Cambridge campus on Wednesday didn’t want to talk about it. Most said they didn’t know him.

A 22-year-old student at Boston University who lives near Loureiro’s apartment in Brookline told The Boston Globe she heard three loud noises Monday evening and feared it was gunfire. “I had never heard anything so loud, so I assumed they were gunshots,” Liv Schachner was quoted as saying. “It’s difficult to grasp. It just seems like it keeps happening.”

Loureiro, who was married, joined MIT in 2016 and was named last year to lead MIT’s Plasma Science and Fusion Center, where he worked to advance clean energy technology and other research. The center, one of the school’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.

He grew up in Viseu, in central Portugal, and studied in Lisbon before earning a doctorate in London, according to MIT. He was a researcher at an institute for nuclear fusion in Lisbon before joining MIT, the university said.

“He shone a bright light as a mentor, friend, teacher, colleague and leader, and was universally admired for his articulate, compassionate manner,” Dennis Whyte, an engineering professor who previously led MIT’s Plasma Science and Fusion Center, told a campus publication.

The president of MIT, Sally Kornbluth, said in a statement that the killing was a “shocking loss.” The office of Portuguese President Marcelo Rebelo de Sousa also put out a condolence statement calling Loureiro’s death “an irreparable loss for science and for all those with whom he worked and lived.”

Loureiro had said he hoped his work would shape the future.

“It’s not hyperbole to say MIT is where you go to find solutions to humanity’s biggest problems,” Loureiro said when he was named to lead the plasma science lab last year. “Fusion energy will change the course of human history.”

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