According to authorities, two vacant homes collapsed in the 700 block of Mercy Street at about 12:10 p.m.
Fire crews said one home was vacant and the other was under construction.
Chopper 6 flew over the scene and showed a building that was reduced to a pile of rubble.
A crushed car could be seen under the rubble.
UPDATE: Two rowhouses collapsed today on Mercy Street in South Philly. One was vacant; the other was under construction. No injuries have been reported, and the cause of the collapse is under investigation. pic.twitter.com/Grtltap55Y— Philadelphia Fire (@PhillyFireDept) July 21, 2020
Authorities said all of the workers were able to get out of the building safely.
This is a developing story. Please check back for updates.