Politicians try to calm tensions inflamed by social media after stabbing in Belfast

Attack was filmed and shared online prompting Elon Musk and others to call for anti-immigration protests

Politicians from across the spectrum have called for calm after a knife attack in Belfast, Northern Ireland, prompted widespread shock and condemnation.

There are fears that there could be widespread disorder after figures on social media including Elon Musk called for people to fill the streets in protest against immigration. The alleged perpetrator of the attack, which was filmed and shared widely online, was revealed today as an asylum seeker from Sudan.