Three people onboard a small plane in southern California died Sunday after the aircraft crashed into an airport hangar shortly after taking off, officials said.

It was early morning, at about 6:30 a.m., when the single-engine plane crashed, killing everyone on board, the Federal Aviation Administration said, per CBS News.

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The San Bernardino County Fire Protection District posted on social media that it was responding to a commercial structure fire at Cable Airport in Upland. Shortly after, it wrote an update: "IC advising knock down on fire. Three occupants of aircraft located deceased. Units committed to overhaul. Investigators enroute."

Firefighters from the department reportedly arrived to find the plane engulfed in flames. There was concern over the hangar and a fuel truck nearby catching fire as well, but firefighters quickly put the flames out and ensured there was no more risk. No injuries to the firefighters were reported.

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Both the FAA and National Transportation Safety Board are investigating, the agencies said. The Upland Police Department is also investigating.

Upland is a city about 35 miles east of Los Angeles.