Bachelet told reporters that more than 9,000 firefighters and other responders have been enlisted to battle the fires, which have destroyed almost 1.2 million acres in seven regions of the South American nation.
"We are fighting the fire without pause and without precedent," Bachelet declared.
More than 4,500 volunteer firefighters and members of the country's national forest brigades plus some 4,600 police officers and other public officials are battling the blaze.
The fires have forced more than two thousand people into shelters, and have damaged or destroyed more than 4,000 dwellings.
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A Russian aircraft with a 42-ton water-carrying capacity is due to arrive tomorrow, while Brazil and Peru were also expected to send firefighting aircraft.
According to the latest report by Chile's national forest service, Conaf, there are a total of 110 separate fires, 50 of which are under control, while 60 are still being fought.
Fires are common in Chile's parched forests during the southern hemisphere's summer. Most are caused by human activity. More than 35 people have been arrested and accused of playing a role in starting or propagation the fires.