SDLP leader Colm Eastwood is seeking a meeting with the Apprentice Boys of Derry after one flute band participating in Saturday's 'Relief of Derry' parade displayed the Parachute Regiment logo and the letter 'F' on their shirts.
It comes just weeks before 'Soldier F' is due to appear in court in the city, charged with murder and other offences on Bloody Sunday.
Colm Eastwood says Derry has been a model of respect, reconciliation and leadership when it comes to parading, and the Apprentice Boys need to understand the level of real pain this caused.
The PSNI is investigating, with the DUP's Sammy Wilson accusing them of picking on the band.................
Last night, police were attacked with paint and petrol bombs in the city.
It happened in the Madams Bank Road area last night.
Meanwhile, police are appealing for information after around 20 petrol bombs were thrown at officers during disturbances in the Fahan Street area on Saturday night.
At one point,they say, two petrol bombs were thrown over the City Walls, close to the Memorial Hall were an Apprentice Boys event was taking place.