A woman with a knife injured 14 children at a nursery in the western Chinese city of Chongqing, according to police.
Police say a 39-year-old woman carrying a kitchen knife entered the school in the Banan district on Friday morning, as the children were in the playground.
School security guards attempted to restrain the woman while bystanders began to take matters into their own hands, kicking the woman once she was subdued.
No information about the attacker was given, other than her surname, Liu.
The injured were rushed to a nearby hospital for treatment.
The attack took place at about 9:30 am (0130 GMT) local time, according to the department.
In another incident a year ago, a man climbed the wall of a kindergarten and knifed 11 children. The videos showed small children bleeding from severe cuts to their faces at the entrance to the kindergarten as stunned adults looked on.
Police said the assailant was unemployed and carried out the attack "to take revenge on society".
There have been reports in the media of two of the victims dying as a result of the attack, but this has not been confirmed by police so far.
These attacks are often blamed on people with the mental illness or the personal grievances.
In April this year, nine students were stabbed to death in a similar attack at a middle school in Shaanxi province.
A spate of killings of school children in 2010 prompted a response from top government officials and leading many schools to add gates and security guards.