Police and firefighters were first called to the 4500 block of Larchwood Avenue at 12:40 a.m.
That initial call was for a man suffering injuries from fireworks.
Authorities say the man in his 30s had extensive injuries to both hands and his eyes.
He was taken to Penn Presbyterian Medical Center for treatment.
Officials say he had some type of modified firework that went off.
The apartment building was evacuated as the bomb squad investigated.
RELATED: Check the 6abc Neighborhood Safety Tracker