Two Thai and three Burmese workers died after inhaling poisonous gas while connecting pipes in a biogas well at a pig farm in Ratchaburi’s Pak Tho district on Sunday morning, police said.

Pol Maj Passakorn Yuyen, the duty officer at Pak Tho police station, said the incident took place at the pig farm of SPM Animal Feed Co in tambon Huay Yang Thon at about 9am.

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