If you go through the articles on the Internet, you will just think that two religious groups in England, one Christian, the other unknown, had a fight on a school bus. According to Bare Naked Islam, groups of angry Muslims attacked the Bradford Catholic School bus.
Apparently, the impetus was forced integration.
Stones and half-bricks were thrown at the three buses and terrified pupils had to dodge the missiles which smashed windows causing £600 worth of damage. Read here: BareNakedIslam