A convenience store clerk in Ingram shot and seriously wounded a knife-carrying robber this morning.

Ingram police Chief John Doherty said the clerk may have fired at the would-be thief inside and then outside the 7-Eleven store at 10 W. Prospect Ave.

"He shot the robber several times. I'm not sure how many," Chief Doherty said this afternoon in a telephone interview.

But the gunfire began in the store about 4:30 a.m. and then apparently continued outside, Chief Doherty said.

He declined to identify either the clerk or the robber. Chief Doherty said the would-be thief is 20 years old and the clerk is in his mid-20s.

Emergency crews transported the robber to Allegheny General Hospital, where he underwent surgery, Chief Doherty said.

He said the clerk may have had a less serious injury.

"I believe the clerk was cut," Chief Doherty said.

Chief Doherty said the preliminary investigation showed that the clerk had a permit to carry a firearm. He said he knew this particular clerk because he had been robbed previously and Ingram police investigated the case.

Allegheny County police will be the lead agency in the case and file any charges, Chief Doherty said.

Hopefully no charges against the clerk.