A 12-year-old girl is recovering in hospital in southern China after a boy threw a 15-cm long knife and it penetrated the back of her head, a newspaper reported. A friend with the girl got into an argument with the boy at a park in Dongguan in Guangdong province after school hours on Monday, the Guangzhou Daily reported. Chinese police arrest suspect four days after knife-attack killing of city official As they walked away the boy threw the knife, but hit the wrong person, the report said. The knife lodged about 3cm into her skull. The knife did not puncture any major veins or arteries and the article said that if the weapon had penetrated further it could have killed the girl. The knife has been removed after surgery and the girl is due to be released from hospital next week, according to the article. The father of the boy who threw the knife was called to the hospital after the operation and paid 8,000 yuan (HKD9,500) in medical bills. Brutal knife attack at Hong Kong fruit market linked to triad revenge hits Further compensation is still being discussed, the report said. As the knife thrower is under 14 and below the age of criminal responsibility in China, he was let off with a caution from police, according to the article.