OITA (Kyodo) Three workers who died Saturday after collapsing inside an ore carrier vessel docked at a smelter in Oita, southwestern Japan, suffocated due to lack of oxygen, police said Sunday.

The Oita prefectural police made the announcement after inspectors of the Land, Infrastructure, Transport and Tourism Ministry’s Japan Transport Safety Board began an on-site examination of the ship at the facility of Nikko Seiren, a Tokyo-based smelter of nonferrous metals.

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