Someone involved in target practice near Blacks Creek Reservoir caused a wildfire Sunday afternoon, according to Bureau of Land Management investigators. The fire was reported at about 3 p.m.

Blacks Creek Reservoir is about 10 miles southeast of Boise. The Blackshot fire had burned just 5 acres at about 4 p.m., and it was declared controlled by 5 p.m., according to Brandon Hampton, a BLM fire information officer.

At 8 p.m., about 20 firefighters were still at the scene mopping up and making sure that an errant ember doesn't cause the fire to flare up again overnight, Hampton said.

He said the investigation into the cause of the fire is ongoing, but BLM officials have "conclusive evidence" that the fire was sparked by target shooting. He said he did not know if it was caused by an exploding target or a bullet that ricocheted on rocks, though he said it was likely the latter.

Hampton would not comment on whether there were witnesses to the start of the fire. He said there was an abundance of "fresh" shell casings at the scene.

"That's as much information that investigators are giving out," he said.

This year, target shooting and other gunfire has caused at least 21 wildfires in Utah and about a dozen in Idaho.