A fire that broke out near Sugarloaf Road and Lost Angel Road on Tuesday afternoon prompted a call to evacuate residents and closed roads as fire crews wrestled with the blaze.

The fire was first reported shortly after 4 p.m. and grew to about seven acres before fire crews had it contained at about 6 p.m., according to the Boulder County Sheriff’s Office.

As the fire was contained, the sheriff’s office lifted evacuations, but it had sent out a 198 notifications via a reverse 911 call. Evacuations had been called for along Lost Angel road toward Dream Canyon road.

No injuries were reported.

Sheriff’s Office Cmdr. Mike Wagner said that the fire was burning close to old mining sheds which typically have explosives inside, but a bomb technician at the scene said that the explosives would burn up in the fire but not explode. It had not been confirmed as of Tuesday evening whether any explosives were present.

Video shot at the scene showed that the fire burned close to structures, and firefighters were working in breezy conditions.

The sheriff’s office closed Sugarloaf Road between Mountain Meadows and Sugarloaf Mountain roads. Lost Angel, Owl Creek, North Gulch and Good Friday roads were also closed and people were asked to stay away from the area so fire crews could work.

Wagner said the fire was first reported as coming from a lightning strike. He said the official cause of the fire has not been determined — and would fall under the purview of the Sugarloaf Fire Protection District, which did not have any information on Tuesday evening.

The National Weather Service is calling for a 20 percent chance of thunderstorms in Boulder County on Wednesday, mostly after 2 p.m. Those conditions are expected to continue through the rest of the week.

John Bear 303-473-1355, bearj@dailycamera.com or twitter.com/johnbearwithme