Homes burn as the Yarnell Hill Fire burns in Glenn Ilah on Sunday, June 30, 2013 near Yarnell, Ariz. The fire started Friday and picked up momentum as the area experienced high temperatures, low humidity and windy conditions. It has forced the evacuation of residents in the Peeples Valley area and in the town of Yarnell. (AP Photo/The Arizona Republic, David Kadlubowski)

David Kadlubowski

Prescott Fire Department confirmed 19 firefighters have died while battling the Yarnell Hill fire Sunday night, Fox 10 news is reporting.

They're part of the Prescott Granite Mountain Hot Shots. 

The wildfire was likely caused by a lightning strike Saturday night.

The Yarnell Hill fire, about 35 miles southwest of Prescott, has burned about 1,300 acres and forced the evacuation of 50 homes. 

The fire started Friday and has not yet burned down any structures, but Sunday night firefighters pushed the blaze back away from communities, hoping to keep the blaze from overtaking any homes. 

A growing fire in Yarnell forced about 600 residents from their homes.