At least five adults and three children were taken to the hospital to be evaluated for possible exposure to carbon monoxide, in Southeast, D.C. due to a defective furnace, DC Fire and EMS said.

The carbon monoxide incident happened in the 1600 block of 16th St. in Southeast, officials said.

Crews were initially dispatched for a medical call for fainting.

Officials identified the cause as a defective furnace. Red Cross has been requested to help the remaining residents.