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Several dozen Moscow hooligans attacked a bus carrying fans to the capital of St. Petersburg.
The long-standing hatred between these clubs erupted on Sunday when hooligans blocked the "Zenit" bus with cars and started pelting it with stones, then began hitting it with baseball bats and metal bars.
It is not yet clear how many people were injured, but it is believed that there are more than 10. Police detained several suspects.
During the match, which will take place in the sold-out 60,000-seat "Luzhniki" stadium, order will be maintained by about fifteen hundred officers.
The mass brawls between "Zenit" and "Spartak" fans that took place in 2005:
Events of 2007: