A C-134 Tanker, a firefighting aircraft, being used in the effort to save Australia from historic wildfires has crashed, killing three U.S. firefighters on board.

Individuals from several countries have helped fight against the Australian wildfires, responding to Australia’s international call for help. Twitchy reports the horrific tragedy occurred when the C-134 tanker was looking for fires over a New South Wales mountain range.

News 7 Brisbane reports the plane may have been on fire as it went down, all the while losing communication capabilities. The wreckage of the plane was eventually found in difficult terrain, with only the tail of the plane remaining.

Twitchy reports that several people expressed their condolences for the loss of life, including Australia Parliamentary member Scott Morrison.

“Deeply saddened to learn of the death of 3 people in the crash of a C130 fire fighting aircraft, northeast of Cooma in NSW earlier today,” Morrison tweeted. “My deepest condolences to the loved ones, friends, and colleagues of those who have lost their lives. Such a terrible tragedy.”

Australian Fire and Emergency Service Authorities Council (AFAC) News also expressed their condolences.

Here’s more information on the crash, per Twitchy:

For those unfamiliar with the firefighter aircraft, view the below pictures and video to see how it helps eliminate or contain wildfires:

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