Philadelphia :

Police have arrested a man they believed attacked a woman before throwing her onto train tracks.

Update :

A suspect is in custody after a man punched a young woman in the head, dragged her by the ankles and threw her onto train tracks this week, a Southeastern Pennsylvania Transportation Authority spokeswoman said Friday.

William Clark, of Philadelphia, faces assault, robbery, theft and reckless endangerment charges, said Heather Redfern, the SEPTA spokeswoman. The suspect is thought to be between 25 and 30 years old, she said.

The attack occurred around 3:30 p.m. Tuesday in Philadelphia's Chinatown, after a man approached a 23-year-old woman and asked her for a lighter. They were the only people at the Eighth and Race streets stop, Redfern said.