A rural Ellendale man injured Wednesday in an explosion at a truck service shop in North Mankato was listed in stable condition Friday morning.

Leon Nelson, 59, was taken by helicopter to Regions Hospital in St. Paul with first- and second-degree burns.

The explosion happened just before noon Wednesday at Allstate Peterbilt.

North Mankato Police Chief Ross Gullickson said employees were working on a garbage truck when the vehicle began leaking compressed natural gas into the shop. Employees were evacuating the building when the natural gas ignited, causing the explosion.

A 41-year-old Gibbon man injured his hand and was treated at the scene.

The State Fire Marshal’s Office and North Mankato Fire Department are investigating the explosion.