In Chongqing, in southwest China armed with a kitchen knife the woman attacked the children, 14 children were injured. She was later restrained by the school's security guards and staff members, who handed over the assailant to the police.
No other information about the attacker was given, other than her surname, Liu.
The knife attack happened at about 9:30 am on the morning of Friday, October 26, 2018, at the gate of Xinshiji Kindergarten in Banan District of China's southwestern city of Chongqing.
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.
Videos circulating on social media show grief-stricken parents in floods of tears as their children were ushered into a local hospital, some with bandages on their heads, heavily bloodied.
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Violent crime is rare in China compared with many other countries, especially in major cities where security is tight, but there has been a series of knife and axe attacks in recent years, many targeting children. The videos showed small children bleeding from severe cuts to their faces at the entrance to the kindergarten as stunned adults looked on.
An unknown number of students were taken to a nearby hospital following the incident, according to police.
A woman on Friday attacked more than a dozen schoolchildren with a knife in China.
Nearly 20 children were killed in school attacks in 2010, prompting a response from top government officials and leading many schools to add gates and security guards.