Refinery blast at Exxon facility in California, injures 4

An explosion and fire ripped through a gasoline processing unit at an Exxon Mobil refinery in Torrance, California, near Los Angeles early today, slightly injuring four workers and shattering windows of surrounding buildings, authorities said.

Investigators were trying to determine the cause of the blast, which occurred shortly before 1am Hong Kong time, but there was no evidence of foul play, according to Torrance Fire Captain Steve Deuel.

Deuel said a small ground fire following the explosion was quickly extinguished. Firefighters and refinery crews also contained a gasoline leak caused by the blast, he said.

"All personnel have been accounted for," Exxon Mobil said in a statement. "Four contractors have been taken to Long Beach Medical Center for evaluation for minor injuries."

Torrance Mayor Patrick Furey told local television station KNBC in an interview that people who live near the refinery should take precautions.

"The most important thing is to shelter in place, stay indoors, no outdoor activity, turn the air conditioners off, keep the windows closed," Furey told the station.

A structure at the refinery was visibly damaged, with smoke smoldering from twisted metal, and the air near the blast site smelled of sulfur and chemicals.