NJ Transit said service has resumed after two trains collided in Montclair, New Jersey Friday night, injuring more than a dozen people.

The agency began alerting customers at around 7 p.m. that train service on the Montclair-Boonton line had been suspended due to “police activity” near the Bay Street station.

It was later revealed the police activity was because two NJ Transit trains had collided, “leading to a minor derailment” according to agency posts on social media.

NJ Transit said the accident led to 17 “non-life threatening” injuries. Six people were hospitalized — all of them NJ Transit crew members — but were released as of Saturday morning, the agency said.

Service resumed on the line at around 10 a.m. Saturday.

The National Transportation Safety Board said its team arrived Saturday to lead an investigation into the collision.