That is according to three people familiar with the matter who were not authorized to discuss an ongoing investigation and spoke on condition of anonymity. Two of the people said investigators had identified a person of interest in the shootings and were actively seeking that individual.
The attacker at Brown on Saturday killed two students and wounded nine others in a classroom in the school's engineering building before getting away.
About 50 miles north, Massachusetts Institute of Technology professor Nuno F.G. Loureiro was gunned down in his home Monday night in the Boston suburb of Brookline. The 7-year-old physicist and fusion scientist died at a hospital the next day.
The FBI previously said it knew of no links between the cases.
In connection with the Brown shooting, investigators have released several videos from the hours and minutes before and after the shooting that show a person who, according to police, matches witnesses' description of the shooter. In the clips, the person is standing, walking and even running along streets off campus, but always with a mask on or their head turned.
