UTV News producer Conor Shanley has posted an image of the cordoned-off scene near to the small explosion in Belfast city centre:
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"Our own president uses words infamously spoken by Josef Stalin to describe his enemies," Senator Jeff Flake said.
The Met Office has issued a fresh amber warning of heavy snow for southern Scotland and northern England on Wednesday into Thursday.
Speaking from the backbenches, the former education secretary said future MPs could "improve or undo" what is implemented.