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Michelle Tessier, Deseret News
Emergency personnel respond to a grass fire in Riverdale, Wednesday, June 11, 2014.

RIVERDALE, Weber County — Officials believe children lighting the fluff from cottonwood trees ignited a nearly 5-acre blaze near homes Wednesday.

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One child was on the Weber River Parkway near 3750 South and 600 West about 4 p.m. and lit some of the cotton seed on fire to show his friends how fast it burned, Riverdale Fire Chief Roger Bodily said.

The boy burned his hand and dropped the cotton, which fell into more cotton.

"It took off from there," Bodily said.

The fire was about 85 percent contained and had burned nearly 5 acres within two hours, Bodily reported.

The smoky fire burned along the edge of nearby homes, but no structures were threatened, Bodily said. Some residents evacuated as a precaution.

Fire crews from Ogden, South Ogden, South Weber, Roy and the U.S. Forest Service assisted in fighting the blaze.

— McKenzie Romero