UTV News is reporting that police has confirmed there has been a small explosion in the Cathedral Quarter of Belfast.
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Tory Eurosceptic Jacob Rees-Mogg played down the significance of the deal struck by the Government to win over pro-EU rebels.
The Tanaiste issued the warning to the UK ahead of a visit to Dublin by European Commission President Jean-Claude Juncker.
The Coca-Cola London Eye also opened extra-early to mark the occasion.