Pittsburgh EMS, Police and the Pennsylvania State Police responded to the 700 block of Casino Drive for a male shot around 1 a.m.
When first responders arrived, they located the male victim on the upper level of the garage.
He was transported to a local hospital in stable condition with a gunshot wound to the leg.
The suspect was arrested on scene without incident. Upon early investigations, police learned the victim and suspect knew each other and there was no immediate danger to the public.
SWAT arrived on scene to clear the parking garage.
The investigation is ongoing.