The Deputy First Minister of Northern Ireland, Martin McGuinness, is due to address a conference hosted by a father who lost his son in an IRA attack.
Campaigners for justice for the 21 victims of the Birmingham pub bombings have travelled to protest outside the building.
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Krissoni Henderson called his victim a non-believer and a prostitute before branding police "disgusting" atheists.
They were taken as a precaution, and residents are being advised to keep windows and doors closed as teams continue to clear the spill.