TACOMA, Wash. -

A man who ran off after an explosion blew apart a 30-foot trailer in Tacoma was later found and taken to a hospital with burns.

Another man found at the scene Monday morning also was treated at a hospital for burns.

Tacoma Fire Department officials say the blast around 2 a.m. destroyed the trailer, which was parked behind a house.

The Fire Department says investigators determined the explosion was caused by propane gas from a portable tank venting into the enclosed trailer. Despite initial reports, investigators say they found no evidence of a drug lab.