Pittsburgh Police Zone 5 officers responded to 911 calls for an altercation inside the Sunoco gas station on the 500 block of N. Highland Avenue around 8 a.m.
When responding units arrived on scene they spoke with a male clerk from the store who had suffered wounds to his head from a blunt instrument. EMS transported him to the hospital in stable condition.
Another male suffered stab wounds. Police located him on the sidewalk not far from the gas station and medics transported him to the hospital in critical condition.
Violent Crime Unit and Crime Scene Unit detectives processed the scene.
The investigation is ongoing.