Aurora police are looking for a man who assaulted a Subway sandwich shop employee during an armed robbery on Saturday night.

Police issued a summons to a man who attempted to stop the robber, first firing shots into the air, and then shooting at his fleeing car, said Aurora police Sgt. Chris Amsler.

The employee was taken to a hospital with minor injuries.

The incident began at about 7:40 p.m., when the masked suspect entered the shop demanding money. “He got involved in a physical altercation with one of the employees and assaulted her,” Amsler said.

Avery Marquis Nelson, who was outside the shop at 15220 E. Iliff Ave., heard the commotion. When the suspect ran out of the shop, Nelson aimed pepper spray at him, but the man continued to run, Amsler said.

Nelson chased him, and as the two ran north and crossed Iliff, he fired warning shots into the air.

The suspect got into a vehicle parked on South Fraser Street and as he was driving off Nelson ” fired several shots at the vehicle.”

The suspect got into his vehicle, which was parked on South Fraser Street and as he was driving off

Police later found the vehicle abandoned at South Joplin Way and South Idalia Street, Amsler said.

Police issued Nelson a summons for a pair of misdemeanors, reckless endangerment and discharging a weapon. “His conduct created substantial risk of injury,” Amsler said.

Nelson couldn’t be reached for comment.

Police are asking the public’s help to find the suspect. A reward of up to $2,000 is offered for information that helps police identify him.

Tips can be submitted by calling Metro Denver Crime Stoppers at 720-913-7867.

Tom McGhee: 303-954-1671, tmcghee@denverpost.com or @dpmcghee