State broadcaster CCTV said the attack happened in Shaanxi province's Mizhi county as students were leaving the No. 3 Middle School.
The suspect is now in custody, but police have not commented on his motive.
County police said initial investigations suggested that the 28-year-old male suspect was a former pupil at the middle school, where he had been bullied.
Saudi-led strike 'kills dozens' of Yemen rebels
Shortly after Sammad's funeral began, the Huthis said they had launched eight ballistic missiles into the Sunni kingdom. Meanwhile, the rebel-run Al-Masirah TV says Saturday's missiles hit their targets with "high accuracy".
Past year in Shenzhen, in south-eastern China, a man fatally stabbed two people with a kitchen knife and wounded nine others at a supermarket.
The suspect was apparently seeking revenge for having been picked on, the Mizhi government's official microblog said on Saturday.
Injured kids taken to the hospital, they receive medical care.
Essentra plc (LON:ESNT) Weekly Ratings as of April 24, 2018
The target price per share indicates a potential downside of -2.28 % from the previous stock close of Rightmove PLC (LON:RMV). Hastings Group Holdings plc, together with its subsidiaries, provides general insurance products in the United Kingdom.
He said made a decision to take a dagger and kill people on Friday because he hated his classmates.
Private gun ownership is strictly prohibited in China so mostly knives and homemade explosives are used in violent crimes.
"China has seen several fatal knife attacks in recent years", BBC News explains.
No Standing for Monkey to Bring Selfie Copyright Suit
More specifically, the court ruled that a monkey does not have standing to sue over copyright infringement. The ruling added that "PETA seems to employ Naruto as an unwitting pawn in its ideological goals".
An assailant killed seven people and wounded 19 others in an attack using a knife in China's northwestern Shaanxi province on Friday.