Woman reports being sexually assaulted on BART train in East Bay

BART customers enter the North Berkeley station in this file photo. On Wednesday night, a woman reported that a man sexually battered her while on a train between the Richmond and North Berkeley stations. BART customers enter the North Berkeley station in this file photo. On Wednesday night, a woman reported that a man sexually battered her while on a train between the Richmond and North Berkeley stations. Photo: Justin Sullivan, Getty Images Photo: Justin Sullivan, Getty Images Image 1 of / 17 Caption Close Woman reports being sexually assaulted on BART train in East Bay 1 / 17 Back to Gallery

A man who sexually assaulted a woman on a BART train in the East Bay Wednesday night remained on the loose Thursday, officials said.

The victim told BART police she was attacked around 9 p.m. while on a train between the Richmond and North Berkeley stations, according to police.

The attacker fled the train when it reached the North Berkeley Station, where the victim reported the incident, police said. Officers searched the station and the surrounding area, but could not find the assailant.

The victim described the attacker as being in his 20s, about 5 feet 6 inches tall and wearing a hooded sweatshirt.

Bill Hutchinson is a San Francisco Chronicle staff writer. Email: bhutchinson@sfchronicle.com Twitter: @bill_hutchinson