WHEATLAND, Wyo. (AP) — Two wildfires near Wheatland are keeping firefighters busy.

One fire that blackened 6 square miles in Wyoming's Guernsey State Park and forced the evacuation of hundreds of campers and visitors continued to burn on Monday. Between 500 and 1,000 visitors were evacuated from the park when the blaze erupted Saturday. The cause is under investigation.

Meanwhile, firefighters are mopping up hot spots at another wildfire that burned about 13 square miles near Wheatland. Firefighters say they were able to contain about 90 percent of the fire over the weekend.

No injuries or structural damage were immediately reported from either fire.

Meantime, Acting Governor, Senate President Jim Anderson, has activated the Wyoming National Guard to assist in fighting the wildfire which started inside Guernsey State Park. Senator Anderson is Acting Governor while Governor Matt Mead was in China and Secretary of State Max Maxfield is outside of Wyoming. Senator Anderson made the decision to call on Guard resources after receiving a request for support from the Wyoming State Forestry Division.

Sunday afternoon three UH-60 Black Hawk helicopters and their support teams arrived in Guernsey. They were able to start dumping water on the fire Sunday evening. Also in the area are Guard members helping to notify residents of possible evacuations. The 41 Wyoming National Guard troops onsite and working in support of the mission also include 9 firefighters manning two fire trucks.