Police say a suburban Philadelphia pharmacy owner shot and killed a would-be robber wearing a Halloween mask and carrying a shotgun.

Falls Township police Lt. Henry Ward says the gunfire broke out just before 10 a.m. Friday at the Pennsbury Pharmacy. He says the gunman got out of the passenger seat of a minivan in the parking lot, walked in and went behind the store counter before the pharmacist fired nearly a dozen rounds at him.

Ward says the owner watched on his security camera as the man came into the store with a shotgun and he was prepared for him.

Police also arrested another man in the stolen van outside the pharmacy.