(CNN) A large fire broke out early Friday at an oil refinery in Philadelphia, rattling the area with at least one booming explosion and lighting up the dark sky with huge balls of gas and flame. The explosion and fire came from a vat of butane -- one of the products that come from the process of refining crude oil -- at the Philadelphia Energy Solutions refinery starting around 4 a.m., city Deputy Fire Commissioner Craig Murphy said. Social media recorded a massive fireball from the Philadelphia oil refinery early Friday. Right now, companies are making sure that the fire does not spread," Murphy told reporters after dawn. By 7 a.m., the flames were significantly lower, video from CNN affiliate WPVI showed -- a stark contrast to the massive fireball that bystanders recorded on social media earlier in the morning.

Source: CNN June 21, 2019 09:52 UTC