Youths attack PSNI vehicles as they try to prevent members of Derry 1916  Commemoration Committee from taking part in an unregistered parade in the the Creggan area of Derry, Northern Ireland. Photograph: Niall Carson/PA Wire

Petrol bombs have been thrown at police during an illegal dissident republican Easter parade in Derry. Up to 50 youths, some wearing masks, repeatedl(...)