YARNELL, Ariz. — An elite crew of firefighters trained to battle the nation’s fiercest wildfires was overtaken by an out-of-control blaze in Arizona, killing 19 members as they tried to protect themselves from the flames under fire-resistant shields.

It was the most firefighters killed battling a wildfire in the U.S. in decades.

The lightning-sparked fire, which spread to at least 2,000 acres amid triple-digit temperatures, also destroyed 200 homes and sent hundreds fleeing from Yarnell, a town of about 700 residents about 85 miles northwest of Phoenix. Residents huddled in shelters and bars, watching their homes burn on TV as flames lit up the night sky in the forest above the town.

The disaster Sunday afternoon all but wiped out the 20-member Hotshot fire crew based in nearby Prescott, leaving the city’s fire department reeling.

“We grieve for the family. We grieve for the department. We grieve for the city,” Prescott Fire Chief Dan Fraijo said at a news conference Sunday evening. “We’re devastated. We just lost 19 of the finest people you’ll ever meet.”

The National Fire Protection Association website lists the last wildland fire to kill more firefighters as the 1933 Griffith Park fire of Los Angeles, which killed 29. The most firefighters — 340 — were killed in the 9/11 terrorist attacks in New York, according to the website.

Most people had evacuated from the town, and no injuries or other deaths were reported.

Hotshot crews go through specialized training and are often deployed soon after a fire breaks out. Sometimes they hike for miles into the wilderness with chain saws and backpacks filled with heavy gear to build lines of protection between people and fires. They remove brush, trees and anything that might burn in the direction of homes and cities. This crew had worked other wildfires in recent weeks in New Mexico and Arizona.