An explosion left a semitrailer driver with second-degree burns Tuesday afternoon.

The Duluth Fire Department responded to a report of a truck explosion at 1:40 p.m. The male truck driver, whose name was not released, was using a pump from the enclosed trailer attached to the semitrailer to collect waste oil from a business on 23rd Avenue West and Superior Street.

The pump experienced a malfunction and the mixture of vapor and air caused the pump to explode inside the trailer, according to Duluth Assistant Fire Chief Erik Simonson.

The driver suffered second-degree burns to his torso, upper arms and face.

He was taken to Essentia Health-St. Mary’s Medical Center in Duluth.

The truck is from the Rainy Lake Oil company in International Falls.