At approximately 5:30 a.m. Tuesday, the Mercer Island Police and Fire departments responded to a report of a structure fire in the 5900 block of Island Crest Way, said Officer Jennifer Franklin.

There were no injuries, but all lanes of Island Crest Way from the 5300-6000 block were blocked temporarily. The school district was advised of the incident for bus transit planning.

Island Crest Way is now open, but the 8800 block of S.E. 59th is still closed. Delays are possible.

Update:

The homeowners were awakened by noise coming from the garage and found the garage full of smoke with some flames visible. They immediately evacuated the residence and called 911.

The first firefighters arriving on-scene found a fully involved garage fire that had extended through the roof. The fire was fought initially from the exterior to reduce heat, then crews launched an offensive attack to reduce fire spread. The fire was controlled by 6:07am. Extra caution by firefighters was exhibited as a small amount of stored ammunition in the garage exploded during fire. There were no injuries to occupants or firefighters.

Twelve fire apparatus with 33 personnel were used on this fire: in addition to MIFD, apparatus and crews came from Bellevue, Eastside Fire and Rescue (Issaquah) and Seattle Fire. The cause of the fire is currently under investigation.

All roads in the area of the incident have reopened.