An officer whose gun went off inside a Columbia University building this week fired it accidentally as the police were removing pro-Palestinian protesters from the campus, the New York Police Department said on Thursday.

No one was injured during the shooting on Tuesday, and the bullet ended up in the frame of a wall a few feet away, the N.Y.P.D. said in a statement. The police will hold a news conference about the episode on Friday at 11:30 a.m.

The officer, who was not identified, was…