A quote from The London Evening Standard, 5 October 2006

Extra police are being drafted into the Windsor area today after three nights of violent clashes between white and Asian youths. Gangs have fought battles in the streets using baseball bats and pitchforks. A Muslim-run dairy which wants to build a mosque was petrol bombed. [...] The Queen usually spends weekends at Windsor Castle and no decision has yet been taken over whether she would change her plans. A senior source said: “We are aware of what is happening and all appropriate security measures are in place.”

[...] Earlier this week the Queen gave permission to convert a room at Windsor castle into a prayer room. The room in the Saxon Tower allows Nagina Chaudhry, who works in the castle gift shops, to carry out the halfhour lunchtime prayer which is required of all Muslims during Ramadan.