A major highway near downtown Los Angeles has been closed in both directions after a fire rampaged through storage lots underneath it.

The fire sent towering flames into the night sky early on Saturday morning. Daybreak revealed twisted guardrails and blackened, chipped concrete at an Interstate 10 overpass in an industrial zone.

The California Department of Transportation sent personnel to inspect the highway, with detours established to ease snarled highway traffic.

Interstate 10, which runs east-west, was closed near downtown Los Angeles for at least 24 hours, authorities said. The cause of the fire hasn’t been disclosed.

A Los Angeles firefighter uses a robotic hose to douse a fire under Interstate 10 that severely damaged the overpass. – AP

The fire department said the blaze burned through trailers, wood pallets and other things in storage lots on both sides of the highway, though firefighters successfully safeguarded three nearby commercial buildings.

Democratic Governor Gavin Newsom declared a state of emergency and directed the state Department of Transportation to request assistance from the federal government.

“The state is mobilizing resources and taking steps to ensure any necessary repairs are completed as soon as possible to minimize the impact on those traveling in and around Los Angeles,” Newsom said.

More than 160 firefighters from 26 companies responded to the blaze, which spread across 8 acres (3 hectares) – the equivalent of six football fields – and burned parked cars and damaged a support for high-tension power lines.

Fire department spokeswoman Margaret Stewart said there were no injuries reported from the fire, which was mostly extinguished by late morning.