One person has been injured during disturbances linked to the Queen's visit to Northern Ireland.
Republicans had erected an Irish flag and a sign which said "Eriu is our Queen" on Black Mountain in West Belfast.
A confrontation is believed to have ensued over the sign. Eriu is a goddess in Irish mythology.
A Police Service of Northern Ireland spokeswoman said on Tuesday: "Police are investigating reports of a spontaneous disturbance on Black Mountain at approx 6pm this evening. One person has been injured and has been taken to hospital."
The injuries are not life-threatening.
Earlier, police confirmed they were aware of various items having been erected on Black Mountain. There were no offences committed but police were continuing to monitor the situation.