The Northeastern University campus in Boston was the scene of a package explosion that injured one staff member late on Tuesday.

The FBI is aiding with the investigation, according to the authorities, after a second suspicious item was discovered close to a well-known art gallery.

Two packages were reported to authorities early in the evening, one of which exploded. A second bomb was defused by the Boston bomb squad near the Museum of Fine Arts and the Northeastern campus.

The item that burst reportedly happened as it was being opened close to Holmes Hall, which contains the university’s creative writing programme and the women’s, gender, and sexuality studies programme. In support of the investigation, the FBI was mentioned.

Authorities chose not to provide more information, but Northeastern spokesperson Shannon Nargi said in a statement that a staff member who was there at the time of the explosion and has not been identified received minor hand injuries. Later, Felipe Colon, the chief of Boston police, determined that the victim was a 45-year-old man.

The institution gave the students gathering in the hall for an evening journalism session the go-ahead to depart as soon as the police showed up on campus just before 7:30 p.m.

Northeastern is a private institution with over 16,000 undergraduate students located in the middle of Boston. One of WCVB-reporters, TV’s Mike Beaudet, was reportedly present at the time imparting knowledge. Beaudet told the television that despite the session being moved outside, neither he nor his classmates heard the explosion.

Campus safety is assured by Northeastern University Police Chief Michael Davis. According to Boston police, no other suspicious packages were found.

“We’re following the situation at Northeastern,” Suffolk County District Attorney Kevin Hayden said. “We’re ready to engage with the school and our law enforcement colleagues on any prosecutions that may materialise.” Additionally, he vowed “a thorough investigation to establish just what happened here.”

On the opposite bank of the Charles River from Cambridge and Boston, Harvard University and the Massachusetts Institute of Technology both announced that they were stepping up campus patrols as a precaution and asking employees and students to report any suspicious activity.

One of Boston’s biggest concerns since 2013, when two bombs placed near to the Boston Marathon finish line killed three spectators and injured more than 260 more, was the explosion on Tuesday.