Boston authorities are investigating the motive behind a package sent to Northeastern University when an employee opened it Tuesday afternoon, officials said.
The 45-year-old man who opened the package suffered minor injuries to his hands, university and county officials said.
Investigators have not said how the package arrived on campus, stressing that the investigation is ongoing.
The package contained a note criticizing the relationship between Facebook founder Mark Zuckerberg and academic institutions and virtual reality developers, multiple federal law enforcement sources told CNN.
The package was sent to the university’s virtual reality center and opened by an employee, sources said.
CNN has reached out to Facebook for comment.
The note was in a hard plastic container and it exploded when the victim opened the bottle and lifted the lid, sources said.
Although the worker was not seriously injured, the blast caused injuries to his hands, including lacerations, the sources added.
University spokeswoman Shannon Nargi told CNN the package was delivered to Holmes Hall, which is home to the institution’s virtual reality center.
The situation occurred around 7:18 p.m. when police were called to the scene, Boston Police Chief Felipe Colon said at a press conference Tuesday night.
A minute after the initial call, a Northeastern University police officer arrived at Homes Hall, said Michael Davis, chief of the university’s police department.
University police announced the scene was “consumed” just before 10 p.m
“It’s very important to note that our campus is safe,” Davis said at the press conference.
Boston Mayor Michelle Wu praised law enforcement’s response to the incident.
“We want to make sure that this is our highest priority, the safety and well-being of all our young people here,” Wu said at the news conference.
The FBI Boston Division coordinated with the Boston Police Department, spokeswoman Kristen Setera told CNN.
The FBI Boston provided the full resources of the Joint Terrorism Task Force, its evidence response team and special agent bomb technicians to assist in the investigation, according to Jason Cromartie, assistant special agent in charge.
The university serves more than 16,000 undergraduate students, according to last year’s enrollment report.
The campus is expected to fully reopen Wednesday, the university said.