The firefighters all died sometime late yesterday afternoon while fighting to contain the Yarnell Hill wildfire north of Phoenix, spokesman Steve Skurga told AFP, without giving further details.
He was unable to confirm whether the dead were the same 19 firefighters reported to be missing earlier yesterday by the Arizona State Forestry Division.
The fire broke out Friday and, according to the forestry officials, has covered 800-1,000 acres.
Residents of Yarnell Hill and Peeples Valley were being evacuated, officials said on a fire alert website.
Federal help was expected starting today, it reported, but officials expected that least 250 homes -- about half of the town of Yarnell Hill -- would be destroyed by the inferno.