San Antonio police are investigating a shooting after a man was shot multiple times overnight. Police say the shooting took place in a gas station parking lot in the 10100 block of Culebra. Witnesses say someone in one car opened fire on another vehicle in a parking lot and then fled. The clerk's car that was parked in front of the store was also hit. The victim, in his 20's, is in critical condition. Police are looking at surveillance cameras in hopes of tracking down the shooter.