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A propane service truck driver was in critical condition Tuesday following an explosion at an industrial site in Boyle Heights, officials said.

The incident was reported at 11:51 a.m. in the 1700 block of South Perrino Place near East Washington Boulevard (map), according to Brian Humphrey of the Los Angeles Fire Department.

A 40-year-old driver of a propane service truck was critically injured in the blast, according to Humphrey.

The driver was filling a tank at the industrial firm at the time of the incident, Humphrey said.

No other injuries were immediately reported and was unclear what caused the explosion.

Check back for updates on this developing story.