Violent protests erupted across Northern Ireland after a viral video showed a Sudanese asylum seeker attempting to murder a man in a brutal Belfast knife attack.Demonstrators blocked roads and set fire to vehicles, forcing politicians to issue joint appeals for calm and public restraint.The suspect, a visa holder, was charged with attempted murder while police struggled to contain the rapid escalation of anti-immigration unrest.Authorities warned that the coming hours remain critical as civil disorder spread from the capital to other towns across the region.