A pair of leftover ordnance explosions set off a forest fire near Da Nang International Airport on Thursday.
Authorities suspected that the explosions were caused by unexploded phosphorus shells left over from the Vietnam War, VnExpress reported.
A nearby military command post sent 600 soldiers and ten fire fighters to battle the blaze two hours after it broke out.
The fire was the second in Da Nang this month. An inferno on May 2 consumed 100 hectares of reeds in Nam Hai Van forest, which was used to serve as a makeshift American air base.
It took around ten hours for more than 1,000 people to put out the fire caused by phosphorus shells ignited by the heat.
Vietnam's central region remains the most war-ravaged area in the country.
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