A military truck carrying missile parts exploded inside a South Korean highway tunnel on Tuesday, YTN television reported.

The truck was in a four-vehicle convoy when its brakes failed on the highway linking the southern city of Taegu and Masan, just west of Pusan where a summit meeting of the Asia-Pacific Economic Cooperation forum is scheduled for later this month.

No casualties were reported, YTN said.

A police officer said by telephone there were reports of a fire but could not provide further details. It was not immediately clear whether the truck was South Korean or belonged to the U.S. military, which has troops stationed in the country.

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