PORTLAND, OR (WHDH) — An explosion ripped through two food carts in Portland, burned down one tree and damaged at least ten cars.

Fire officials said the flames started when an employee poured fuel in a gas generator while it was still hot.

One witness said he was not sure what had happened because of the size of the explosion.

“It was a large explosion and it just kind of pushed a few different cars each way, so yeah, I don’t really know what to think. I was just kind of hoping everybody was okay,” Robert Black said.

Officials evaluated two people at the scene, but no serious injuries were reported.

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