Kitsap County Sheriff’s detectives and deputies, along with Washington State Patrol Interagency Bomb Squad explosive ordnance technicians, are investigating the cause of a Thursday morning explosion inside an East Bremerton garage.

The explosion occurred around 7:10 a.m. at a home located in the 100 block of NE Conifer Drive in the Parkwood East neighborhood of East Bremerton.

A 32-year-old man who lives at the home sustained severe injuries to his right hand and light blast burns, shrapnel lacerations and abrasions to his torso and face, according to KCSO. Deputy Scott Wilson, KCSO spokesman, said the man’s right thumb and ring finger were nearly severed. He was treated on-scene by medic crews, then transported to Harrison Medical Center in Bremerton. He was subsequently airlifted to Harborview Medical Center in Seattle.

Three other people — a 23-year-old woman and two teenage boys — inside the house at the time of the explosion were not injured.

Wilson said investigators searched the home and found various materials used to make illegal fireworks, including M80s and M100s.

Explosive ordnance technicians will determine the chemical elements or compounds involved in the explosion and the specific actions of injured man that may have caused the explosion, according to KCSO.

Detectives also will determine if the man was engaged in criminal activity that resulted in the explosion.

Upon completion, the case file investigation will be turned over to the Kitsap County Prosecutor’s Office for review and filing of any criminal charges, if applicable.