It is still not clear whether children were among those killed in the attack.

The injured have received medical treatment, among which six were slightly injured while trying to dodge the attack, according to the local public security authorities, Xinhua reported.

Police have brought the suspect under control.

She was identified as 45-year-old Pan.

Further investigation into the attack is currently underway.

Parents have expressed their fear after they came to know about the attack.

"I received the news at noon, and I was very shocked," one told the BBC, speaking on the condition of anonymity, "My child is in the fifth grade and very young and has safely arrived home, but the school has not informed us of anything and has kept everything hidden. I am going back to comfort my child and to find out what exactly happened."

China has recorded several knife attack incidents in recent months.