HONG KONG — A woman with a knife attacked students at a kindergarten in southwestern China on Friday, injuring 14 children before she was stopped by teachers and guards, the police said.

The attack at the kindergarten in the Banan district of the city of Chongqing happened at about 9:30 a.m. as children were returning to class after morning exercises outdoors, the Chongqing police said in a statement.

The injured children were all sent to hospitals for treatment. There was no immediate word on their conditions.