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The terrorism threat level in Northern Ireland has been raised from substantial to severe. The rating, by MI5, means that an attack is now 'highly likely'. The Northern Ireland Secretary, Chris Heaton-Harris, said the public should remain vigilant, but not be alarmed.

We hear from the Belfast Telegraph's crime correspondent, Allison Morris, and Foyle MLA, Mark H Durkan, who sits on the Northern Ireland Policing Board.