Wildfires that began several days ago are menacing the outer edges of Vina del Mar and Valparaiso, two coastal cities popular with tourists. The urban sprawl of those cities accounts for more than a million residents west of the capital Santiago.
Drone footage filmed by Reuters in Vina del Mar area showed entire neighborhoods scorched, with residents rummaging through husks of burnt-out houses where corrugated iron roofs have collapsed. On the streets, singed cars littered the roads.
Chilean authorities have introduced a 9 p.m. curfew in the hardest-hit areas and sent in the military to help firefighters stem the spread of fires, while helicopters dumped water to try to douse the flames from the air.
Chile's Legal Medical Service, the state coroner, said 99 people have died in the fires, with 32 bodies identified.
Earlier in the day Boric, announcing two days of national mourning starting on Monday, said Chile should prepare itself for more bad news.
"It is Chile as a whole that suffers and mourns our dead," Boric said in a televised speech to the nation. "We are facing a tragedy of very great magnitude."
Hundreds of people also have been reported missing, authorities said. More than 1,000 homes have been damaged. Officials on Saturday said more than 90 fires were raging across Chile.
Although wildfires are not uncommon during the Southern Hemisphere's summer, the lethality of these blazes stands out, making them the country's worst national disaster since the 2010 earthquake in which about 500 people died.
Last year, on the back of a record heat wave, some 27 people died and more than 400,000 hectares (990,000 acres) of land were affected.
Boric has sought to channel funds to the hardest-hit areas, many of which are popular with tourists.
"We are together, all of us, fighting the emergency. The priority is to save lives," Boric said.
