Police in Northern Ireland said they had arrested a Sudanese national over a knife attack that left one person with serious wounds and is currently being treated as attempted murder but not a suspected act of terrorism.

They also called for calm from the public amid calls from far-right figures for anti-migration protests, a year after a week of rioting shook Northern Ireland following the alleged attempted rape of a schoolgirl. Assistant Chief Constable Ryan Henderson said he shared 'the public’s revulsion over the brutal nature of this attack'Image: Liam McBurney/PA Images/picture alliance

What did police say about the crime?

Northern Ireland's Assistant Chief Constable Ryan Henderson declared Monday night's crime a "critical incident" but said investigators had found no indications of a terrorist motive as yet. "I understand that last night's attempted murder will ‌leave people ​feeling a range of emotions, from fear to anger," Henderson told a press conference. "I appeal for calm and the safety of all of our communities in response to ​this."

The victim, a man in his 40s, suffered severe injuries to his eyes and slash wounds to his face and back in the attack involving a kitchen knife, Henderson said.