Three people were killed by carbon dioxide while climbing down a well in Vietnam's Central Highlands Wednesday night.
Romah Kynh, 36, was the first victim after he climbed down the well eight meters deep in Gia Lai Province to fix a bump.
Kynh fainted and fell to the bottom of the well.
His brother in law and a niece met the same fate when trying to save him.
Local health officials said the men were killed by too much carbon dioxide.
Families of each victim have been supported with VND3.5 million (US$168).
Fatal gases formed in wells kill regularly in Vietnam, especially in rural and mountainous areas where wells are the common, if not the only source of water.
At least seven people were killed by well gas in 2010, two in 2009, six in 2007 and four in 2005.
Experts suggested that the wells were not cleaned properly and could have accumulated a large amount of lethal methane gas in those cases.
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