However, unlike in mainland Britain, the police will not be deploying soldiers to support officers guarding high profile events.
Commenting on the local Policing response to the increased international terrorist threat, PSNI Chief Constable George Hamilton said:
“Last night Prime Minister Theresa May reported that the threat level across the UK has increased from severe to critical level.
“This critical threat level (when an attack is expected imminently) also applies to Northern Ireland.
“In response to this increased threat I have reviewed our operational profile. The public will see an increased police presence at iconic sites, our transport networks and where large numbers of people congregate.
“Op Temperer, the military deployment in response to the Manchester attacks will not apply here.
“In addition, it has been well documented that the current threat level from violent dissident republicans across Northern Ireland is ‘severe’. This remains the case.
“Events in Manchester are at the forefronts of all our minds.
“We send our thoughts and our sympathy to those who have lost loved ones and to the injured.
“The PSNI will continue to do all we can operationally to keep people safe , however, I would ask the public, as always, to remain vigilant and alert to any suspicious activity and report anything untoward to police,” added the Chief Constable.