Mark H Durkan was speaking after several incidents at Saturday’s event.

An image was widely shared of a bus load of some visitors to the city urinating at a roadside on the Culmore Road.

Similar incidents were observed in other parts of the city.

The ‘East Bank Protestant Boys Londonderry’ paraded around the Derry Walls with a banner of Gary Lynch, listed in the CAIN Troubles archive as a member of the Ulster Defence Association (UDA). According to CAIN, Lynch was shot dead by the IRA in August 1991.

Also on Saturday at the ABOD parade, the Tullycarnet Flute Band from east Belfast carried a banner with a UDA emblem on it as they marched from the Waterside area and through the city centre.

Sinn Fein Foyle MLA Pádraig Delargy said: "Once again, visiting loyalist bands have shown a disgu

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