Security footage shows assault inside Philadelphia elevator.

Philadelphia police are searching for the man who attacked a senior citizen at a Septa station on July 2.

The 86-year old man was choked and robbed inside an elevator at the Market-Frankford Line’s Church Street station.

Surveillance video shows the suspect grabbing his victim by the throat and going through his pockets.

Investigators say the crook got away with $500 and the victim’s driver’s license.

It's the latest round of trouble on Septa trains and buses.

On Wednesday, a man was arrested after bringing an assault rifle and other weapons onto a train on the busy Broad Street line.

Safety is an issue for SEPTA drivers, because of a dramatic increase in violent attacks over the last two years.