The chief of police in Londonderry has appealed for calm as scenes of violence against PSNI during a dissident parade have been condemned by politicians across Ireland.A number of missiles were hurled by young people at a PSNI Land Rover monitoring the parade in the Creggan area of the city on Easter Monday.

The chief of police in Londonderry has appealed for calm as scenes of violence against PSNI during a dissident parade have been condemned by politicians across Ireland.A number of missiles were hurled by young people at a PSNI Land Rover monitoring the parade in the Creggan area of the city on Easter Monday.