A large fire lit up the Philadelphia city-scape early Friday morning.
According to Fox 29 in Philadelphia, there was an explosion at the Sunoco Refinery just before 4:30 am ET.
The oil refinery, also known as Philadelphia Energy Solutions is located on the south side of the city near the Delaware River.
According to the companies website, the plant has been in operation for more than 150 years and it remains the largest oil refining complex on the U.S. Eastern seaboard.
People in the area have taken to Twitter saying they felt and hear the explosion.
Several roads in the area remain closed as crews work to battle the flames.
There is no word yet on whether there are any injuries from the accident.