UPDATE 11:45: Lewis and Clark Co. Undersheriff Jason Grimmis says a man was working on a propane truck inside a garage when something ignited the propane and sparked the explosion.

Grimmis says the worker was a contractor from Boise brought in to work on a truck for Montana Propane. The contractor suffered significant burns. He was taken to St. Peter’s Health for treatment.

According to the Undersheriff, the truck had a 3,000 gal. tank that was 80 percent full. The shop where the truck was parked was destroyed. York Rd. between Lake Helena and Valley Dr. has been reopened to traffic.

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HELENA- Firefighters have dispatched to a reported fire in the area of Lake Helena Drive and York Rd.

Crews were dispatched just before 10:30 a.m.  Pictures from the scene show flames shooting high into the air.

According to the Lewis and Clark County/ City of Helena 911 Facebook page the fire is the result of a propane explosion on the 3600 block of York Rd. Officials say the incident involves in excess of 2,000 gals. of propane.

Callers to KTVH in Helena reported hearing and feeling an explosion that shook their home. One resident in the subdivision say the explosion shook their home; another one said she saw a truck flying through the air.

Officials say injuries have been reported. People are asked to avoid the area.

We have reporters on the scene and will update you when we learn more.