SAN BERNARDINO, Calif. — A ferocious wildfire had swallowed up many homes as it spread across 40 square miles of mountain and desert east of Los Angeles. Exactly how many, however, and to whom they belonged, remained uncertain.

Firefighters were faced with the difficult task of tallying that damage while still battling the huge, unruly blaze amid hot, dry and gusty weather that was expected through Thursday evening.

That left evacuees in a cruel limbo, forced to spend another night wondering whether anything they owned was still intact.

They included Shawn Brady, who had been told by a neighbor that flames had raged down their street. But he was waiting for official word.

“What I’ve been told is that flames are currently ripping through my house,” said Brady, a dockworker who lives on the outskirts of the evacuated town of Wrightwood with his mother, sister and a dog.

“I’m trying to remain optimistic,” Brady said as he sat outside a shelter for evacuees in Fontana. “It’s the not knowing that’s the worst.”

San Bernardino County fire officials could only confirm that dozens of structures had burned, and that big numbers are likely.

“There will be a lot of families that come home to nothing,” county Fire Chief Mark Hartwig said Wednesday after flying over a fire scene he described as “devastating.”

“It hit hard. It hit fast. It hit with an intensity that we hadn’t seen before,” he said.

Firefighters had at least established a foothold of control of the blaze the day after it broke out for unknown reasons in the Cajon Pass near Interstate 15, the vital artery between Los Angeles and Las Vegas. The fire was 4 percent contained on Wednesday.

The California Highway Patrol reopened I-15 late Wednesday night, while the southbound side remained closed. Reopening the south side Thursday depended on repair of guardrails.