Crowds have dispersed from City Hall and Newtownards road areas. But police still remain in Albertbridge road area. There are reports that St Matthew's Catholic Church in east Belfast is being attacked by loyalists.
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.