THE BRONX - Detectives need help finding two men behind a violent armed robbery in Woodlawn. 

Police released surveillance video of the suspects, who they say walked up to a 21-year-old man on Kepler Avenue and pulled out a gun. 

Investigators say the men assaulted the victim and took his iPhone before getting away in a white Chevy van. The vehicle was last seen heading south on Van Cortlandt Park East. 

Anyone with information that could help should call Crime Stoppers at 1-800-577-TIPS.