A police officer who was involved in clearing protesters from a Columbia University administration building earlier this week fired his gun inside the hall, a spokesperson for District Attorney Alvin Bragg’s office confirmed Thursday.

No one was injured, according to spokesperson Doug Cohen, who said there were other officers but no students in the immediate vicinity. He said Bragg’s office is conducting a review.

He did not provide additional details on the incident, which was first reported by news outlet The City.

The New York Police Department did not immediately respond to The Associated Press’ request for comment.