The two firefighters who were most seriously injured when a remained hospitalized, LAFD Capt. Erik Scott said in a video update on social media. The incident involved a semitruck's fuel tank cylinder containing compressed natural gas.
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One was in stable but critical condition at Los Angeles General Medical Center's burn unit and the other remained admitted for observation at Harbor-UCLA Medical Center, Scott said.
The released firefighters will continue to receive treatment for injuries including burns, blunt trauma, shrapnel wounds and effects on their hearing, Scott said. The fire department has not released the names of the injured firefighters. It has identified the firefighter in the burn center as a 37-year-old man who has been with LAFD for nine years.
Meanwhile, newly emerged dashboard camera video emerged showed the intensity and size of the explosion. The footage begins with firefighters dousing water on an apparently routine fire on a semitruck. The eruption then occurs suddenly, violently throwing at least one firefighter into the air.
Authorities said the truck was powered by compressed natural gas and one of its two 100-gallon fuel tanks blew up.
The other tank remained in the mangled wreckage but is believed to now be empty, said department spokesman Nicholas Prange. An extensive investigation is underway.
9 LAFD firefighters injured, 2 critically, in Wilmington explosion involving natural gas cylinder
The driver of the truck escaped injury after noticing something was awry with the big rig's tractor and stepped away to call 911, officials said.
The tractor was fueled by compressed natural gas carried in two 100-gallon tanks, one of which exploded six minutes after firefighters arrived on the scene.
Video from AIR7 HD showed charred and mangled parts of the truck along with discarded firefighting gear where the injured crew members were initially treated.
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"Today is a day, I think, where all of us can take a moment to recognize how intrinsically dangerous firefighting can be," said LAFD Chief Kristin Crowley.
The Associated Press contributed to this report.