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The rear of a box truck exploded in the middle of a street in Boyle Heights Friday evening. No injuries were reported, firefighters said.

Authorities are now working to determine what led to the explosion, which occurred shortly before 6 p.m. at 2720 E. Olympic Blvd.

It may have been caused by a propane tank that was being hauled on the back of the truck, according to Los Angeles Police Department Officer Drake Madison.

The L.A. Fire Department previously described the truck as a "semi trailer truck" and initially said it collided into a nearby gas station, then later determined that wasn't the case.

After the blast, the truck's driver parked it near the gas station, then he and the passenger exited to safety, fire officials said.

LAPD was interviewing the truck's two occupants, both males. No arrests were made, according to Madison.

The men recycle scrap metal and had a load on the truck at the time, LAFD Battalion Chief Gregg Avery said.

Avery added that he didn't "know anything about a propane tank."

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Please watch: "Surveillance video shows San Francisco man discussing plans for attacks on California "
https://www.youtube.com/watch?v=VnpLV_P95_s
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