Polling stations in Derry may have to close in future because of rioting youths, electoral chiefs warned tonight.

Petrol bombers who unleashed a wave of violence in Derry as European Election polling ended were provoked by a heavy police presence, the city’s mayor claimed today.

A Sinn Féin councillor, who was leader of the Fianna, the junior wing of the IRA in Derry, tonight denied its members were involved in attacks on the British army on Bloody Sunday.