along kelly drive in philly early may when terrence samson was pulled over in his black range rover withis wife and child inside. samson and two members of the police department's homeland security unit he can changed words. >> listen, man, ya'll bleep, man -- >> it's cool. listen. >> get in the car. >> listen, i am, i am. all right, i am. >> open the door. >> dude. >> call the man back tell him i called for the supervisor. >> after samson, 30 a city worker refused to hand over his keys, officer joe simpson appears to make a fist and strike samson in the head. >> i swear to god, man,. >> hey, hey, hey. >> the video recorded by samson's wife was seen by police for the first time when fox 29 broadcast it. the department spokesperson says, the internal affairs bureau opened its investigation after seeing the report. so has the district attorney. da seth williams says, his office is conducting a review of the case and evidence, a review which includes the video. >> i swear to god, man. >> hey, hey, hey. >> now officer simpson and his partner christopher bins have declined comment. in their p