A Gwinnett County man underwent emergency surgery Wednesday night after being shot in his driveway during a robbery, according to police.

The man, whose name was not released, was on the driveway of his Greenleaf Drive home when he approached by a man with a gun, Capt. Ben Haynes with Lilburn police said.

“There is no indication that they knew each other at all,” Haynes told The Atlanta Journal-Constitution.

The suspect shot the man before running away, Haynes said. The victim was in critical condition, but is expected to survive his injuries, police said.

Investigators remained on the street, near U.S. 29, for several hours Wednesday night searching for the suspect, Haynes said. A witness reported seeing someone running up the street after a shot was fired.

The suspect is described as a slender male wearing a white shirt and black pants.