WEST PHILADELPHIA (WPVI) -- SEPTA says surveillance video appears to show a man who died after becoming trapped under one of its elevated subway trains intentionally jumped in front of the train.The incident happened some time before 12 p.m. Tuesday on the eastbound Market Frankford elevated rail line at 56th and Market Streets.Images from Chopper 6 HD overhead showed a train stopped at a SEPTA station and firefighters working near the front of the train.Action News received word before 12:30 p.m. that the victim had died.SEPTA officials reviewing surveillance video of the incident said a short time later it appears the man intentionally jumped onto the tracks into the path of the oncoming train.The incident remains under investigation.Service was suspended on the Market Frankford line, and SEPTA was running shuttle buses between 52nd Street Station and 69th Street Terminal, as crews worked to remove the victim's body.There was no immediate word on the man's identity.