More than 20 students were taken to a Winter Haven hospital after a carbon monoxide detector went off at the school, according to the Winter Haven Police Department. It happened Friday morning at Cypress Junction Montessori School.>> Video above: Top headlines in Central Florida The school was immediately evacuated, police said. Fire personnel confirmed the source of the leak was outside the school.All parents have been notified by the school, police said. Eleven students were transported by ambulance and 11 by school bus, police said. All are stable. >> This is a developing story and will be updated as more information is released.

WINTER HAVEN, Fla. —

More than 20 students were taken to a Winter Haven hospital after a carbon monoxide detector went off at the school, according to the Winter Haven Police Department.

It happened Friday morning at Cypress Junction Montessori School.

>> Video above: Top headlines in Central Florida

The school was immediately evacuated, police said.

Fire personnel confirmed the source of the leak was outside the school.

All parents have been notified by the school, police said.

Eleven students were transported by ambulance and 11 by school bus, police said. All are stable.

>> This is a developing story and will be updated as more information is released.