GREENWICH - Greenwich police released a surveillance video Friday from the scene of a gas station shooting that left a clerk wounded.

Police say the incident happened Nov. 21 at around 1 a.m. when a masked gunman stormed into the Mobil gas station and demanded money. After the clerk handed the robber $1,000 in cash, the man shot him in the back of the head.

"This is the type of person we want to get off the streets as soon as possible," says Lt. Dan Allen, of the Greenwich Police Department.

An anonymous donor put up $15,000 to help police find the shooter.