Boston - An MIT police officer in Boston was shot and killed on Thursday night in an apparent shooting incident on the university campus, the Boston Globe newspaper reported.
According to some reporters, at least one person has been taken into custody.
However, the university said in a tweet just minutes ago that the situation was “volatile” and urged students to remain indoors.
MIT said one building on campus had been surrounded by police.
MIT is in the suburbs of Boston, where two bombs at the city's marathon on Monday killed three people and injured 180. However, no link between the two incidents has been immediately made.
The university alert said the gunshots started at 22:48 (02:48 GMT) and that the building where the shots were fired had been "surrounded by responding agencies."
"The area is cordoned off. Please stay clear of area until further notice," added the alert.
There was a major police presence in the district including officers with rifles and a search helicopter overhead, news reports said.