updated 1:30 PM EST, Sun November 17, 2013  By CNN Staff

  • The incident occurred in Waltham, Massachusetts
  • Children were in Sunday school
  • Some kids went to hospitals, others went to family physicians

(CNN) — High levels of carbon monoxide in a Massachusetts church building Sunday sent at least 20 children to hospitals, a fire official said.

The incident occurred at St. Mary’s Education Center in Waltham, deputy chief Michael Quinn of the Waltham Fire Department said.

The department got a call about a suspected gas leak while about 50 children between the ages of 8 and 12 were inside for Sunday school.

The children were evacuated and put in a church basement, Quinn said. When firefighters got to the scene, they determined the problem was spurred by elevated levels of carbon monoxide, not a gas leak.

Symptoms of exposure to elevated carbon monoxide levels include dizziness, headaches, and a pink hue to the skin, Quinn said.

Newton-Wellesley Hospital in Newton accepted 17 children who were transported, and Mount Auburn Hospital in Cambridge accepted three children. Seven parents took their children to their own physicians.