Firefighters say a wildfire that broke out in grass and scrub oak near Cheyenne Mountain may have been started by lightning.

Colorado Springs Fire Lt. Brian Keys says the five-acre fire Friday likely was sparked by a lighting strike Thursday that smoldered.

He says there's no evidence of any suspicious activity.

The fire came within about 300 yards of homes, but firefighters say it did not move aggressively.

Two firefighters were treated for dehydration.