NOTE: This post has been updated from an earlier version.
UPDATE, 9:30 p.m.: Fire Commissioner Lloyd Ayers said the fire was brought under control shortly before 7:30 p.m.
No firefighters were hurt battling the blaze, but a member of the city's fleet management department who was at the scene helping to refuel the fire trucks fell on a patch of ice and suffered a minor injury, Ayers said.
Fire officials will be out at the scene again Tuesday, determining how best to reenter the property to begin their investigation into the blaze, Ayers said.
The fire also forced the closure of two schools in West Philadelphia on Tuesday.
A massive fire is burning through the roof of an apartment building in West Philadelphia.
The fire started shortly after 3 p.m. at 48th and Walnut streets and fire fighters are still battling the blaze. Several people have been evacuated.
The Red Cross, which said that about 90 apartments have been affected, announced that it is moving its reception center to the Alain Locke School at 46th Street and Haverford Avenue. It had been in the auditorium of West Philadelphia High School, at 47th and Walnut.
The Philadelphia Gas Works was on the scene in case further emergency assistance was needed, authorities said.
No injuries have been reported. Some reports indicated that at least one person had been killed, but Fire Department Executive Chief Daniel Williams said that no one had been injured or killed.
It is now a five-alarm blaze, Williams said.