Chicago, IL – A carbon monoxide leak over the weekend put seven people in area hospitals.

The victims became sick on Sunday afternoon at the Church of the Pentecost, at 7919 S. Ashland Ave. in the Gresham neighborhood.

Fire crews believed a faulty boiler was to blame.

A church service was in progress at the time of the incident, fire officials said. Services were cancelled for the rest of the day.

The conditions and ages of the victims were not learned.