The two single-engine planes collided at noon Thursday afternoon during firefighting activities in southeastern Nevada, according to reports.
Both pilots were killed in the collision and a recovery effort was underway, Las Vegas FOX 5 reported.
“We offer our sincere condolences to the families of the two pilots and to all those working with the BLM Nevada County Ely,” BLM Nevada State Director Jon Raby told the station.
“BLM” refers to the State Bureau of Land Management.
A Federal Aviation Administration (FAA) spokeswoman told Fox News the crash happened as planes were fighting Bishop Fire near Caliente, Nev., Around 1 p.m.
The FAA and the National Transportation Safety Board (NTSB) will lead the investigation, and the NTSB will determine the probable cause of the crash.
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Investigators have not yet verified the tail numbers of the plane at the crash site.
Each plane had only one pilot on board, authorities said.
Aircraft tanks can carry as much as 800 gallons of fire retardant and can provide service to areas that are inaccessible to large tankers, FOX 5 reported.
The 500-acre wildfire started Wednesday in an area about 17 miles west of Caliente and 150 miles northeast of Las Vegas.