Unexploded ordnance left over from the Vietnam War has killed more than 42,000 people since the conflict ended more than three decades ago.
Deadly accidents continue daily, a senior military official says.
US forces used 15 million tons of bombs and ammunition during the war and an estimated 800,000 tons of unexploded ordnance still contaminates 20 per cent of the country's area, Vice Defence Minister Senior Lt Gen Nguyen Huy Hieu wrote in the state-run People's Army newspaper.
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