Two sanitation workers and the contractor who had employed them died of suffocation in a manhole at Panvel in neighbouring Raigad district, police said Wednesday.
The incident took place at Kalundre village Wednesday evening, a police official said.
The labourers were engaged in cleaning a sewage line when they apparently suffered suffocation due to poisonous gases inside a manhole, he said.
Two of the deceased were identified as Vikas Mhaskar, the contractor, and Santosh Waghmare, a labourer. Identity of the third person is yet to ascertained.
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