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RCMP say the fire is believed to be related to the grow operation at a seniors-care home in New Brunswick. (CBC)

Police in central New Brunswick are investigating a marijuana grow operation discovered at a special care home for seniors by emergency crews responding to a fire.

Firefighters, who were called to the Forever Young facility on Shore Road in Clarks Corner at about 11 a.m. local time Thursday, noticed what appeared to be a grow-op in the basement and alerted police.

RCMP obtained a search warrant and seized 550 plants — enough to produce up to 275,000 joints, growing equipment and a large quantity of marijuana, Cpl. Brian Villers said in a release.

Investigators believe the fire is related to the grow-op, said Villers.

All residents of the home got out safely, he said.

Forever Young Special Care Home has six beds and provides Level 1 and Level 2 care, according to the New Brunswick Special Care Home Association Inc. website.