Investigators looking into still-smoldering hay fire

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PHOENIX -- A massive hay fire that started at Banning Farms in the West Valley Thursday night re-ignited Friday morning.

Hay fire

Investigators looking into still-smoldering hay fire - A massive hay fire that started at Banning Farms in the West Valley Thursday night re-ignited Friday morning.

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Crews were on the scene at 67th Avenue and Broadway Road late into the night as 1,000 bales of hay burned.

Mother Nature kicked in and helped, dumping quite a bit of rain on the area. That allowed firefighters to get the upper hand on the blaze.

Some of those flames kicked back up early Friday morning. The hay bales had been broken down and doused with water, which should help keep those flames from getting out of control.

Later today, investigators will be out at Banning Farms, which sells hay, to try and determine the cause of the fire. Hay fires like this are often the result of spontaneous combustion. Excessive moisture in the hay allows microorganisms to grow and generate heat. Between that heat and the heat from friction inside the bales, the hay can suddenly ignite and burst into flames.

Hay fires can be particularly difficult to completely extinguish as flames smolder deep inside the bales or piles of hay and can quickly flare back up. It's not uncommon for hay fires to burn for several days.

No injuries were reported.