An ambulance medical technician went into a Carle Place Dunkin' Donuts for coffee in the predawn hours of Friday, but it was a carbon monoxide scare that woke him up, Nassau police said.

The Nassau County emergency technician was wearing a personal carbon monoxide detector and it alerted him to high levels of the gas when he went into the store on Glen Cove Road just before 4 a.m., police said.

He escorted employees out and called authorities, police said.

The Carle Place fire department arrived and confirmed that carbon monoxide levels were 35 parts per million.

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Investigators discovered an oven vent that was not working, police said.

No injuries were reported, police said.