A Sudanese national was on Tuesday night being held on suspicion of attempted murder after a frenzied knife attack in Belfast left a man with significant eye injuries and prompted online attempts to provoke violent street protests.  Police in Northern Ireland called for calm amid concerns that demonstrations in Belfast and elsewhere could lead to disorder following online postings by far-right groups demanding that shops be closed by 5.30pm and streets sealed off.  One widely distributed social media message called for protest participants to “prepare to fight or be arrested”. Far-right leader Tommy Robinson separately shared a list of 70 protest sites, calling on people at locations from London to Dumfries to gather […]