Building Blocks Learning Center plans to close permanently after at least 11 people were hospitalized in the gas leak.

"If a State Fire Marshall cannot tell the difference between these detectors, how can I be expected to?" the daycare owner told families.

Boonsboro Volunteer Fire & Rescue reports responding to a home with a carbon monoxide leak resulting in injuries on February 19. Boonsboro Fire officials said around 9:23 p.m. on Wednesday, crews responded to a home at the 3000 block of Trent’s Ferry Road after reports of a person with carbon monoxide

A report from the state fire marshal's office sent to parents shows Building Blocks Learning Center had several violations, including a lack of carbon monoxide detectors and fire extinguishers.

A Kittery child care center where nearly a dozen people were treated for carbon monoxide poisoning last week did not have a working carbon monoxide detector.

While a cause has been determined behind what caused a carbon monoxide leak at a New England day care on Wednesday, it continues to be under investigation.

Several students and staff members needed medical treatment after being exposed to carbon monoxide inside the building.

Building Blocks Learning Center in Kittery announced its immediate closure Thursday after a carbon monoxide scare last week.