Northern Ireland's Deputy First Minister Martin McGuinness has said last night's violence in Derry, which followed the Apprentice Boys' Parade, was unacceptable and sectarian.
He challenged those behind the violence to try and defend the incidents.
Mr McGuinness said the vast majority of people in Derry want to get on with the job of moving the city forward, while those behind the disturbances seem to be wedded to an entirely different agenda.
Four men have been arrested in connection with the rioting in Derry.
Vehicles were hijacked and petrol bombs were thrown at police.
In one of the hijackings a mother and her daughter were dragged from their car in the Creggan Street area.
Police were also targeted with a pipe bomb near Free Derry Corner after the march took place.
Officers said the device exploded but there were no injuries and no damage to property.
SDLP Assembly member Mark H Durkan said: ‘Some of the people carrying out these disturbances are alarmingly young and are causing a huge amount of distress to the people of the Bogside.’
Reverend David Latimer of the First Derry Presbyterian Church said violence was not the answer.
