A knife-wielding man slashed four students, wounding one seriously, state media reported Thursday, the latest in a string of violent acts at Chinese schools.

Xinhua News Agency said the four students were wounded when a man with a knife broke into a high school in Fuzhou, capital of southeastern China's Fujian Province, Wednesday.

It said a teenage girl was in critical condition, while the other three were out of immediate danger.

The victims are all in grade 11. Xinhua gave no other details or motive for the attack, the latest in a series of random incidents at China's schools.

Last Friday, police shot dead a suspected mentally ill man who threatened to blow up a school in southern China with dynamite, according to the Beijing Morning Post.

It said police shot the man after several hours of unsuccessful negotiations. The man was suspected of having a mental illness, but the newspaper did not say what was behind his actions.

Also last week, Xinhua News Agency reported that a man broke into a primary school in Guangdong province in southern China and killed a 9-year-old boy with a kitchen knife, Xinhua said. Three other students were seriously wounded.

Xinhua said the attacker had been seen quarreling with the dead boy's parents in the past.

Xinhua reported earlier this month that a teacher in northwestern China has been sentenced to death for raping 18 primary school girls.

It said Cheng Laifu, a teacher in Changhe township in Dingxi city in Gansu province, was convicted of raping the 18 grade three and four students on 70 separate occasions between September 2001 and March 2005. The victims were 9 and 10 years old.