Pittsburgh Bureau of Police officers from Zone 2 and the Zone 2 substation responded to reports of a stabbing inside Triangle Park in the 500 block of Market Street just after 12:30 p.m.
When officers arrived on scene they found a female victim with a stab wound to her arm inside Triangle Park. She was transported by EMS in stable condition to a local hospital.
Officers were able to quickly apprehend a male suspect across the street on Liberty Avenue at Market Street.
He was taken into custody and transported to Allegheny County Jail.
The Mobile Crime Unit processed the scene.
UPDATE: Police have arrested Johnny Lee Martin, 36, of Alabama on charges of aggravated assault, possessing instruments of crime, resisting arrest, flight to avoid apprehension and paraphernalia use or possession.
Johnny Lee Martin