As the fires raged, crews rescued 17 people who jumped into the Lahaina harbor in an effort to escape the flames, the U.S. Coast Guard said.

 As the fires raged, crews rescued 17 people who jumped into the Lahaina harbor in an effort to escape the flames, the U.S. Coast Guard said.

 On Front Street, a popular tourist destination, business owner Alan Dickar described seeing buildings on both sides of the street "engulfed" in flames. "There were no fire trucks at that point; I think the fire department was overwhelmed," Dickar told CBS Honolulu affiliate KGMB-TV. 

Speaking later to CBS News' Patrick Torphy, he added: "Maui can't handle this. ... A lot of people just lost their jobs because a lot of businesses burned. A lot of people lost their homes. ... This is going to be devastating for Maui."

How do wildfires usually start?

Almost 85% of wildfires in the United States are caused by humans, according to the National Park Service. Fires that are sparked this way can result accidentally from leaving campfires unattended, burning debris, using various kinds of equipment and discarding cigarettes improperly. Intentional acts of arson are another source of human-caused wildfires, the agency says.

Lightning and volcanic activity are two natural causes of wildfires, although officials note that lightning strikes are a much more common catalyst. 

Certain weather can ignite and help spread fires, with strong winds, low relative humidity, unstable atmospheric conditions and thunderstorms contributing to what meteorologists call "fire weather," said Nick Nauslar, a meteorologist and former weather forecaster at the National Oceanic and Atmospheric Administration's Storm Prediction Center, in a 2018 FAQ published by the agency.