CANNON BALL, N.D. (AP) – A large grass fire on the Standing Rock Indian Reservation in the Dakotas was fully contained Tuesday, while students and staff at a school affected by an earlier fire had a second day off from classes.

The fire near Wakpala that started Monday grew to about 4.5 square miles, but no structures were threatened and no injuries were reported, said Johnelle Leingang, the tribal chairman’s executive secretary and a member of the tribe’s emergency response team.

It was contained early Tuesday, though officials were still monitoring flare-ups and putting out isolated hot spots, she told The Associated Press.

“You’ve got all this brush and trees,” Trail City Fire Chief Kelly Landis told The Bismarck Tribune. “This is going to be a five-day-to-a-week job getting that all out.”

Wind gusts surpassing 50 mph on Sunday and Monday fanned the two large reservation fires. Conditions were much calmer Tuesday, with the National Weather Service reporting wind speeds in the single digits and teens.

Students and staff at a school in Cannon Ball that was damaged by a larger fire Sunday likely won’t be able to return for a couple of weeks.

The elementary school suffered smoke damage, and flames melted plastic equipment on the playground. Classes were canceled Monday and Tuesday.

Starting Wednesday, the 115 students and teachers will go to the high school in Solen, Superintendent Justin Fryer told KXMB-TV.

The Cannon Ball blaze burned nearly 8 square miles, destroyed three houses and a church, and prompted hundreds of people to be evacuated. The flames spared the school but covered desks and equipment with soot and ashes.

“We’ll have to wipe everything down, and maybe do it twice,” custodian Jesse Black Cloud told the Tribune.

The school will be contacting its insurance company to cover the cost of cleanup and repairs. Officials also are in the process of trying to secure a federal grant for a new school, as parts of the current facility date to the 1930s.