PHILADELPHIA (CBS) -- Philadelphia police are investigating a robbery that turned fatal when a North Philadelphia store owner allegedly shot the would-be robber.

Police say it happened at the Super Pro shoe store in the 2900 block of North 22nd Street at about 1:15 p.m. Monday. They say a man in his 20s attempted to rob the store, pretending to have a weapon.

According to police, the store owner had a real gun, which he fired at the man, killing him.

It was not immediately known if the owner had a permit to carry the weapon. The investigation is ongoing.

Reported by Pat Loeb, KYW Newsradio 1060