A 21-year-old man faces charges of attempted murder and armed robbery after a shooting Thursday at the corner of Sumner and Attaway streets in North Charleston.

Police arrested Travis West of Sumner Avenue after the 2 p.m. incident, and he remains locked up at the Charleston County jail.

A man flagged down an officer at the intersection as police were responding to a 911 hang-up call. The officer found 22-year-old Terrance Green of North Charleston lying on the backseat of a car with a gunshot wound to his upper right arm, according to a police report.

The officer told the men with Green to wait for paramedics to arrive, but they tried to drive off and get him help on their own, police said. Officers stopped the car and had the men wait until medical help arrived. Green was then taken to an area hospital, a police report states.

Police spoke with West a short time later. He told officers a man pulled a gun on him and forced him to accompany him to see Green, whom West described as a friend, a police report states. The gunman then shot Green and robbed him of money, he told police.

Police spokesman Spencer Pryor said the incident was confusing, and a lack of cooperation from the victim made things more difficult. In the end, police arrested West after determining he was one of the men who robbed Green, he said. Investigators are still working to identify the gunman, Pryor said.