“We were at two alarms, which is about 50 apparatuses and about 75 firefighters and medics,” said Captain Derrick Bowmer of the Philadelphia Fire Department.
Officials said it started with small fires in several piles of debris that were at least six stories high.
Crews were forced to keep a safe distance while spraying water and foam due to the intensity of the flames.
Smoke from the two-alarm blaze could be seen all over the city and even across the Delaware River in New Jersey.
“I work down in these yards all day long and I’ve never seen anything in my life like that,” said Keith Knighten of Southwest Philadelphia.
Police continue to block several side streets and intersections along South 61st Street around the fire scene Wednesday.
No injuries have been reported.
The cause of the fire is under investigation.