Two firefighters were killed Sunday when they were ambushed by sniper fire while responding to a blaze in a northern Idaho mountain community, as crews endured a barrage of gunfire over several hours that the governor called a “heinous” assault. No arrests were announced.

The Kootenai County Sheriff’s Office said crews responded to a fire at Canfield Mountain just north of Coeur d’Alene around 1:30 p.m., and gunshots were reported about a half hour later.

Sheriff Bob Norris said officials didn’t know if anyone else was shot.

“We don’t know how many suspects are up there, and we don’t know how many casualties there are,” Norris told reporters at a 4:30 p.m. news conference. “We are actively taking sniper fire as we speak.”

People are still coming off the mountain, the sheriff said, so it “would be safe to assume” that others were still up there.

Gov. Brad Little said “multiple” firefighters were attacked.

“This is a heinous direct assault on our brave firefighters,” Little said on the social platform X. “I ask all Idahoans to pray for them and their families as we wait to learn more.”

Norris said it appeared the sniper was hiding in the rugged terrain and using a high-powered rifle. He said he instructed deputies to fire back.

“I’m hoping that somebody has a clear shot and is able to neutralize, because they’re not at this point in time showing any evidence of wanting to surrender,” the sheriff said.

An alert by the Kootenai County Emergency Management Office asked people to avoid the area around Canfield Mountain Trailhead and Nettleton Gulch Road, about 4 miles (6.5 km) north of downtown Coeur d’Alene.

The fire was still active, Norris said.

“It’s going to keep burning,” he said. “Can’t put any resources on it right now.”

The FBI has responded to the scene with technical teams and tactical support, Deputy Director Dan Bongino said.