Three others sustained injuries, they added.
The crew members of the TNSTC were sleeping in the building, constructed in 1952, when the collpase happened around 3.30 am, killing them on the spot, they said.
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Nagapattinam District Collector Dr C Suresh Kumar visited the spot and conducted enquiries.
State Transport Minister MR Vijayabhaskar is rushing to Porayar, officials said.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)