HONOLULU (AP) — Wildfires in Hawaii fanned by strong winds burned multiple structures, forcing evacuations and closing schools in several communities Wednesday, and rescuers pulled a dozen people escaping smoke and flames from the ocean.

The U.S. Coast Guard responded to areas where people went into the ocean to escape the fire and smoky conditions, Maui County said in a statement. The Coast Guard tweeted that a crew rescued 12 people from the water off Lahaina. A firefighter responding to the West Maui fire was taken to a hospital after experiencing smoke inhalation and was in stable condition, according to Maui County.

Maui County tweeted that multiple roads in Lahaina were closed with a warning: “Do NOT go to Lahaina town.”

The National Weather Service said Hurricane Dora, which was passing to the south of the island chain at a safe distance of 500 miles (805 kilometers), was partly to blame for gusts above 60 mph (97 kph) that knocked out power as night fell, rattled homes and grounded firefighting helicopters. Dangerous fire conditions created by strong winds and low humidity were expected to last through Wednesday afternoon, the weather service said.

Acting Gov. Sylvia Luke issued an emergency proclamation on behalf of Gov. Josh Green, who is traveling, and activated the Hawaii National Guard.

The Federal Emergency Management Agency approved a disaster declaration to provide assistance with a fire that threatened about 200 homes in and around Kohala Ranch, a rural community with a population of more than 500 on the Big Island, according to the Hawaii Emergency Management Agency. When the request was made, the fire had burned more than 600 acres (243 hectares) and was uncontained. Much of Hawaii was under a red flag warning that continued Wednesday, and two other uncontrolled fires were burning on the Big Island and Maui, officials said.

Fire crews on Maui were battling multiple blazes concentrated in two areas: the popular tourist destination of West Maui and an inland, mountainous region. It wasn’t immediately known how many buildings had burned, County of Maui spokesperson Mahina Martin said in a phone interview late Tuesday.

Because of the wind gusts, helicopters weren’t able to dump water on the fires from the sky — or gauge more precise fire sizes — and firefighters were encountering roads blocked by downed trees and power lines as they worked the inland fires, Martin said.

About 14,500 customers in Maui were without power early Wednesday, according to poweroutage.us.

“It’s definitely one of the more challenging days for our island given that it’s multiple fires, multiple evacuations in the different district areas,” Martin said.

Winds were recorded at 80 mph (129 kph) in inland Maui and one fire that was believed to be contained earlier Tuesday flared up hours later with the big winds, she added.

“The fire can be a mile or more from your house, but in a minute or two, it can be at your house,” Fire Assistant Chief Jeff Giesea said.

In the Kula area of Maui, at least two homes were destroyed in a fire that engulfed about 1.7 square miles (4.5 square kilometers), Maui Mayor Richard Bissen said. About 80 people were evacuated from 40 homes, he said.

“We’re trying to protect homes in the community,” Big Island Mayor Mitch Roth said of evacuating about 400 homes in four communities in the northern part of the island. As of Tuesday, the roof of one house caught on fire, he said.

Fires in Hawaii are unlike many of those burning in the U.S. West. They tend to break out in large grasslands on the dry sides of the islands and are generally much smaller than mainland fires.

Fires were rare in Hawaii and on other tropical islands before humans arrived, and native ecosystems evolved without them. This means great environmental damage can occur when fires erupt. For example, fires remove vegetation. When a fire is followed by heavy rainfall, the rain can carry loose soil into the ocean, where it can smother coral reefs.

A major fire on the Big Island in 2021 burned homes and forced thousands to evacuate.

The island of Oahu, where Honolulu is located, also was dealing with power outages, downed power lines and traffic problems, said Adam Weintraub, communication director for Hawaii Emergency Management Agency.

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Associated Press writer Audrey McAvoy contributed to this report.