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Debris is scattered across the harbor after a boat explosion. (Photo by John Santucci)

A 40-foot boat docked in Sequim, Wash., exploded Tuesday evening seriously injuring one man on board.

Fire officials from Clallam County described the blast as powerful enough to scatter debris across 75 yards and knock the unidentified78-year-old man into the water.

A couple on a nearby boat were initially knocked to the ground by the explosion. After evacuating their boat, the couple spotted the injured man underneath debris and pulled him to safety. He was taken to Port Angeles hospital Tuesday night suffering from broken bones and burns.

An unidentified man is transported from the site of the explosion. (Photo by John Santucci)

Fire officials say that the cause of the explosion is currently unknown. The Coast Guard has sent a team to investigate the incident.

After the boat sank, the Port of Port Angeles, county Fire District 3 and the Coast Guard started containment measures for fuel and oil from the the shattered vessel.