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.