One policeman was killed and three others injured when a knife wielding man went on stabbing sprees in a suspected revenge attack in China's Henan Province.
The man, identified as Deng, attacked the policemen inLuoyang City was subsequently detained.
One police man was killed and another two were injured in the attack.
A senior citizen who was in the crowd sustained injuries, state-run Xinhua news agency reported.
Deng was reportedly angry over the punishment meted out to him for traffic violation while riding his three-wheeled motorcycle.
