Police in the San Francisco Bay Area are seeking the public's help in identifying a man they say is behind two recent violent attacks on commuter trains.

KTVU reports BART police on Monday released surveillance photos of a man they say hit another man on the head with bolt cutters last Thursday.

Two days later, officials say the same suspect hit a man in the mouth twice before fleeing the scene.

Police say the attacks left the two victims with non-life threatening injuries.

Authorities say the attacks were unprovoked but neither passenger was robbed.

Deputy Chief Ed Alvarez says more officers will be patrolling the trains.