An overnight wildfire that scorched six to seven acres in Sandstone Ranch east of Longmont was sparked by a heater in a homeless encampment, fire officials concluded Monday.

There were no injuries and the fire did not threaten any structures.

Longmont Fire spokeswoman Molly Cropp said the origin of the fire was determined to be an abandoned Coleman camp-fuel heater that ignited combustibles on the south side of the soccer fields in Spring Gulch around 8:30 p.m. Sunday.

Cropp said nobody will be charged with starting the fire, but some people who had been in the area could be cited with trespassing in the park after-hours.

Firefighters reached around 90 percent containment of the wildfire around 11:30 p.m. Sunday. As of 4 p.m. Monday, that containment figure was unchanged, with still-smoldering trees all that was left to keep an eye on.

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