Photo: Rich Janzaruk, AP
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In this April 12, 2018 photo, a firefighter battles a blaze at the Fibertech plant in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge people to stay indoors as crews worked to extinguish the blaze. (Rich Janzaruk/The Herald-Times via AP) less
In this April 12, 2018 photo, a firefighter battles a blaze at the Fibertech plant in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge ... more
Photo: Rich Janzaruk, AP
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In this April 12, 2018 photo, smoke envelopes the Fibertech plant during a fire in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge people to stay indoors as crews worked to extinguish the blaze. (Rich Janzaruk/The Herald-Times via AP) less
In this April 12, 2018 photo, smoke envelopes the Fibertech plant during a fire in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge ... more
Photo: Rich Janzaruk, AP
Image 3 of 4
In this April 12, 2018 photo, a firefighter battles a blaze at the Fibertech plant in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge people to stay indoors as crews worked to extinguish the blaze. (Rich Janzaruk/The Herald-Times via AP) less
In this April 12, 2018 photo, a firefighter battles a blaze at the Fibertech plant in Mitchell, Ind. Smoke from the large mulch fire burning in southern Indiana forced schools to close and authorities to urge ... more
Photo: Rich Janzaruk, AP
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MITCHELL, Ind. (AP) — Dozens of people have sought treatment for smoke-related issues due to a large mulch fire burning in southern Indiana that shut some schools Friday and prompted authorities to urge people to stay indoors.

Firefighting crews from across the area responded Thursday to the fire at the Fibertech plant in Mitchell that produces mulch and wooden pallets. Lawrence County officials advised area residents to stay inside their homes as it continued to burn Friday, and state officials said about a dozen families evacuated voluntarily as a precaution.

"Visibility is limited in the area, and firefighters continue to battle the blaze and windy conditions in the area," the Indiana Department of Homeland Security said in a midday Friday statement.

Two hospitals have seen a rise in emergency room visits due to the fire, officials with Indiana University Health said. Health workers at IU Health Bedford Hospital saw about 49 people with smoke-related issues, including 36 who were discharged, and IU Health Paoli Hospital saw three patients.

Eight firefighters have been treated at a hospital for smoke inhalation since the fire began, but are expected to fully recover, the Indiana Department of Homeland Security said.

Lawrence County Sheriff Mike Branham said smoke from the fire could be an issue for days. The Indiana National Guard was deployed Friday to assist in extinguishing the fire using aerial water drops.

Mitchell Community Schools posted a statement online saying classes were canceled Friday due to the smoke and employees have been told not to report to work. The North Lawrence Community Schools district has also shut down schools.

Motorists have been advised to avoid the area about 75 miles (120 kilometers) southwest of Indianapolis.