WEST OAKLAND — BART police have arrested three teen girls accused of assaulting a passenger on a train.

On Feb. 27 at 9 p.m. four teen girls allegedly punched another female passenger multiple times in the head, BART police said. The passenger reported the incident to BART the next day.

Police credit the victim’s description of the incident and other witnesses, including the station agent who saw the girls run off, with helping to identify all four suspects. Three of the four teen girls were arrested; one on Friday, and the others on Thursday and Wednesday. A warrant remains outstanding for the fourth teen, who is expected to be arrested soon, police said.

“Our detectives are actively working these cases involving juveniles: issuing warrants, and making arrests,” said Acting Chief Jeff Jennings. “We’ve increased patrols and police presence, and we’ve kicked off a regional task force to address the increase in crimes committed by juveniles at BART and in the cities we serve.”

The three teens were booked into Alameda County Juvenile Hall on suspicion of battery resulting in great bodily injury.