(NBC News) Surveillance video shows a man using a sledgehammer to attack an SUV driver and passenger in a Philadelphia parking lot.
The attack occurred Tuesday afternoon.
The video shows a man in a red pickup truck follow a gray SUV into the parking lot, then exit his vehicle and smash the driver's window on the SUV with a sledgehammer.
As the SUV drives away, a man falls out of the passenger side. The attacker then strikes him with the sledgehammer before he can escape.
One witness said he heard the attacker yell out "You're cheating with my girlfriend."
Police say they can't investigate it any further until a person involved with the incident comes forward.