LEICESTER, MASS. (WHDH) - A carbon monoxide leak in Leicester sent three people to the hospital Monday night.

Crews responding to a report of an unresponsive person in a residential apartment building on Stafford Street just before 11 p.m. evacuated the building after finding high levels of carbon monoxide throughout, fire officials said.

The cause was traced to a gas hot water heater.

Paramedics transported three people to a local hospital as crews vented the building.

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