An MIT student was jumping up and down on a plexiglass dome skylight before he fell through it, plummeted four stories, and landed on his back, witnesses told Boston police.

The student was taken to Brigham and Women’s Hospital but his injuries were not life-threatening, police said in a statement.

Police also said license premise violations were issued against the Phi Sigma Kappa fraternity.

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MIT officials are gathering information after the incident Wednesday night at the house on Commonwealth Avenue occupied by members of the MIT chapter of the fraternity.

The student is “in the hospital, alert, and has not sustained any life-threatening injuries” from his fall, the university’s news office said today.

“MIT Police took initial statements about the incident and student life officials are gathering further information about the circumstances surrounding the events that evening,” the office said in a statement.

Boston fire officials said the 18-year-old man fell through the skylight and landed on the first-floor staircase of the building on Commonwealth Avenue shortly after 11:30 p.m.

The man asked that his name not be released, MIT said.

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