MI5 raise terror threat level in Northern Ireland to 'severe' - meaning attack is highly likely

MI5 has increased the terror threat level in Northern Ireland from "substantial" to "severe", meaning an attack is highly likely.

Northern Ireland Secretary Chris Heaton-Harris cited a "small number" of individuals who remain determined to use "politically motivated violence".

Announcing the change on Tuesday, he urged the public to "remain vigilant" but "not be alarmed".