The PSNI has confirmed it is investigating the use of flags and symbols on the Londonderry Bonfire, which took place in the Creggan area.
Stewart Dickson MLA said: “The act of burning flags and emblems is a completely disgraceful one and must be condemned.
“Those behind these actions seek only to promote division, but together we must move away from this type of behaviour as we aim to build a society where all groups show respect and tolerance for others.
“Alliance believes people should be free to celebrate their culture in a respectful way and this includes bonfires, but we must ensure they are built free of flags and other inappropriate materials.”