Police in Philadelphia have arrested a man suspected of throwing a woman onto the subway tracks.
Surveillance video captured the incident, which happened on Tuesday.
You can see the man walk up to the 23-year-old woman sitting on a bench.
He reportedly asks her for a lighter, walks away and then moves in and attacks her.
He pulls her off the bench by her feet, drags her and throws her onto the tracks.
The woman managed to pull herself to safety and suffered only minor injuries.