STOCKHOLM, June 1 (Xinhua) -- Four school children were taken to hospital after a knife attack that reportedly involved dozens of people during a sports day in the Swedish city of Eskilstuna on Thursday.
Several police units were dispatched to the sports complex around lunchtime following reports of a brawl.
An eyewitness told Aftonbladet newspaper that the incident involved two groups of approximately 20 people each and that he had seen at least two youngsters with knife injuries.
Police have confirmed that at least one weapon was used but declined to reveal the identity of those injured and the nature of their injuries.
The headmaster of the school in Eskilstuna, some 88 kilometers west of the capital Stockholm, told Dagens Nyheter (DN) newspaper that they were all grade 9 students and that all four suffered knife wounds.
Police have classified the incident as attempted murder.