King County Fire District 28 firefighters responded to a 911 call of an explosion at 4:26 p.m. in the 24900 block of Southeast 433rd Street.

At the scene the firefighters found two boys, one 9 and the other 10, with severe burns.

Interim Fire Chief Randy Fehr said the crew quickly treated the boys at the scene. The 10-year-old boy was airlifted to Harborview Medical Center and the other was taken by Medic One to Harborview, both with severe burns. The 10-year-old is estimated to have burns to about 65 percent of his body.

King County Sheriff’s Office Sgt. Stan Seo said King County fire investigators suspect the boys were playing with gasoline trying to get an outdoor campfire started.

Fehr said he knows both the boys and the family.

“These are good boys,” Fehr said. “This is a tragic accident. The boys were just trying to get a fire going. We’re are all keeping our fingers crossed.”

Fehr said he has contacted the family to provide any assistance he can.

Also responding to the scene were Enumclaw Police officers and the King County Sheriff’s Office deputies.