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”.
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The move comes after a series of incidents targeting security forces in Northern Ireland, including the attempted murder of Detective Chief Inspector John Caldwell in Omagh last month.
The threat level for the rest of the UK remains at “substantial”, meaning an attack is considered “likely”.
Northern Ireland’s level had been lowered to substantial a year ago – the first time it had been altered since 2010.
In a written statement to MPs, Northern Ireland Secretary Chris Heaton-Harris said: “MI5 has increased the threat to Northern Ireland from Northern Ireland Related Terrorism from ‘Substantial’ (an attack is likely) to ‘Severe’ (an attack is highly likely).
“The public should remain vigilant, but not be alarmed, and continue to report any concerns they have to the Police Service of Northern Ireland.”
Mr Heaton-Harris said a “small number of people remain determined to cause harm to our communities through acts of politically motivated violence” as the terror threat level was raised.
“Over the last 25 years, Northern Ireland has transformed into a peaceful society.
“The Belfast (Good Friday) Agreement demonstrates how peaceful and democratic politics improve society,” he said.
“However, a small number of people remain determined to cause harm to our communities through acts of politically motivated violence.
“In recent months, we have seen an increase in levels of activity relating to Northern Ireland-related terrorism, which has targeted police officers serving their communities and also put at risk the lives of children and other members of the public.
“These attacks have no support, as demonstrated by the reaction to the abhorrent attempted murder of DCI Caldwell."
Addressing the increase of the Northern Ireland Related Terrorism threat level, PSNI Chief Constable Simon Byrne said: “Today the threat level has been increased from substantial to severe by MI5. The independent assessment means the threat has moved from an attack is ‘likely’ to an attack is ‘highly likely’.
“This is part of an ongoing process of monitoring the threat level in Northern Ireland, which is conducted by MI5. We have spoken publicly about the number of attacks that have taken place in recent months, not least the attempted murder of DCI John Caldwell on February 22.
“We will relentlessly pursue those who seek to cause harm and terrorise our communities, and attack my officers and staff, and I pay tribute to them as they continue to deliver for our communities.
“I would also like to thank the community and political leaders of Northern Ireland for their overwhelming support for the Police Service in recent times.
“We will not be deterred from delivering a visible, accessible and responsive community focused policing service to keep people safe.”
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