LOS ANGELES (AP) — A Los Angeles police bomb squad responded after an early-morning explosion in a pickup truck shattered windows and prompted evacuations.

Sgt. Mike Kammert tells City News Service the blast happened just before 12:30 a.m. Tuesday in a residential area of North Hollywood.

Officers and firefighters determined that the explosion occurred inside the cab of the pickup, which had its roof blown off.

Kammert says there was at least one propane tank inside the truck. The cause of the blast is under investigation.

No injuries were reported. Some residents living within a square block of the explosion were evacuated, but Kammert says the evacuations were not mandatory and some people sheltered in place.

Residents have since returned home.