A cleaver-wielding attacker injured 14 children at a kindergarten in China Friday morning, police reported.

The suspect, 39-year-old Liu, chased and slashed the pupils as they returned to their classrooms from the playground at the school in Chongqing, south-west China.

Liu was apprehended by the school's staff and security guards before the police arrived at the scene. Police confirmed to MailOnline that all victims were being treated at the hospital and there were no deaths reported.

A cleaver-wielding woman today assaulted children at a kindergarten in China, leaving 14 injured (left). The suspect was apprehended by the school's staff and security guards (right)

The children were going back to their classrooms from the playground at 9:30am when the attack took place. The police said the pupils had just finished their morning exercise session

The suspect is under police control, but no motive for the assault was immediately publicised.

The police report posted on the police force's microblog said the attack at the Xinshiji Kindergarten in the city's outskirts took place at 9:30 am after the children had finished their morning exercise session.

It said all 14 injured pupil had been taken to the hospital and were receiving treatment.

A doctor who answered the phone at the city's Banan People's Hospital confirmed the children were there but declined to give any details or his name, referring questions to the local government.

According to Chongqing Evening News, six of them are seriously injured and one is in critical condition.

No other information about the attacker was given, other than her surname, Liu.

It remains unclear how she had entered the kindergarten.

Footage posted on social media showed injured children walking to ambulances from the school gate, with some being placed on gurneys.

The suspect has been taken in custody and no motive for the assault was immediately publicised. All injured pupils were taken to the hospital immediately and are being treated

China has suffered a number of such incidents in recent years, blamed largely on the mentally ill or people bearing grudges.

In June, a man used a kitchen knife to attack three boys and a mother near a school in Shanghai on Thursday, killing two of the children. Police said the assailant was unemployed and carried out the attack 'to take revenge on society.'

In April, nine schoolchildren were killed and another dozen wounded after a man stabbed them with a knife outside their school in Mizhi County, north-west China's Shaanxi Province. Police deemed the attack a revenge attack and the criminal was given a death penalty and executed.

Chinese law restricts the sale and possession of firearms, and mass attacks are generally carried out with knives or homemade explosives.

Almost 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.