Firefighters are battling a blaze at the former Sunoco refinery in South Philadelphia.

The fire broke out shortly before 6 p.m. at Philadelphia Energy Solutions on the 3100 block of Pennrose Ave. No injuries have been reported. By 6:30 p.m., the bulk of the fire appeared to have been knocked down.

Television helicopters captured images of a small group yellow-jacketed firefighters from the company hosing down a portion of the refinery at the water's edge. City firefighters did not appear to be immediately involved.

This is a developing story.