DERBY, Conn. (WTNH) — Fire crews investigated a burning smell at Griffin Hospital early Friday morning.

According to officials, multiple engines were on scene for a smell of smoke in the building just before 3 a.m. on Division Street.

There was an audible and visible alarm showing with a strong burning odor from the basement and mechanical rooms, fire officials said.

One crew also investigated the roof, as there was also a heavy odor of burning coming from that area.

Hospital maintenance crews were called in to assist, though after walking through the building, were unable to identify the odor.

The Emergency Room is still open and functioning, with nursing stations still manned.

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