MINNEAPOLIS — Statewide fire restrictions took effect Friday, including bans on campfires, as an extended lack of rain, unusually warm temperatures and high winds combined to create explosive conditions across Minnesota.

The Department of Natural Resources limited open burning to special exceptions granted by county, state or federal agencies. Recreational or campfires were allowed only in designated fire receptacles designed for them at residences, campgrounds or resorts.

“The decision to restrict burning is not taken lightly,” said Larry Himanga, DNR wildfire prevention coordinator. “Conditions in the state have created a situation where an ignition source could result in extensive damage or injury.”

Four helicopters spent Friday dropping water on a wildfire that started Wednesday about 10 miles northwest of Greenbush in a remote part of far northwestern Minnesota, fire information officer Ron Sanow said. The Juneberry 3 fire has scorched more than 47 square miles, mostly grasslands, and come within a half-mile of the Canadian border. The soft, boggy soil has made it hard to bring in equipment.

“It’s an airshow at the moment. That’s not the way we like it,” Sanow said, but added that there were no injuries or damage to structures. The cause remains under investigation.