Hay bales catch fire in Canyon County

CANYON COUNTY - A bundle of hay bales go up in flames Monday night at Midland and Linden in Caldwell.

Fire officials tell KBOI 2news the cause of the fire was spontaneous combustion.

Fire officials say it's not that uncommon and can happen if the hay was baled either too wet or too green.

More than 60 bales of hay were destroyed.

Firefighters say the hay will smolder for several more hours until it's out.