Extremely high temperatures and dry conditions are helping fuel a grassfire that started Thursday in Mannford.

In fact, it's grown so much, it's forced crews to close a road. Highway 33 between State Highway 48 and 417th W. Ave. is shut down until further notice.

Authorities told Tulsa's Channel 8's crew on the scene at 5:00 p.m. Friday that the fire covered a 10-square-mile area.

Crews from the Freedom Hill Fire Department tell us it's burned more than 6,400 acres so far.

The general area is Highway 48 to 369th Street West and Highway 33 to 151st Street South.

The fire started at 151st Street and crossed Highway 33.

Due to winds from the south, it began moving north towards 101st Street South Friday afternoon.

Freedom Hill is assisting the Mannford Fire Department, along with crews from Slick, Oilton, Silver City, Drumright, North 48 and Jennings.

Oklahoma Air National Guard is also assisting with air support.

Crews from Freedom Hill tell us at least 20 structures have burned.

Red Cross is on hand to help the more than 200 crews trying to put out this fire.

According to the Mannford Fire Department, the fire had spread as far north as 51st Street South as of 10:00 p.m. Friday night.

The Red Cross opened its Emergency Operation Center due to the escalation of the fire as of 6:00 p.m.

They opened two emergency shelters at 7:00 p.m. for displaced families, one at the

First Baptist Church in Mannford and another at the First Baptist Church in Bristow.

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Just after 8:00 p.m. Friday, the Oklahoma Highway Patrol asked people who lived between Highway 51 South to 81st Street South and Highway 48 to 417th West Avenue in the Mannford area to evacuate their homes immediately.