Why were they so well organized?
Practise makes perfect
What we know about how Northern Ireland's riots were organised
There has been three nights of violence on the streets of Northern Ireland.
Homes and vehicles set on fire; water cannon
deployed; more than a dozen police officers injured; and an atmosphere of fear has descended with reports of people being threatened
for having a "different skin colour" and families being
put out of their homes "because they're black".
It all came after a knife attack in Belfast on Monday night, for which a Sudanese man has been
charged with attempted murder.
Within hours, social media was ablaze with footage of the attack quickly followed by calls for protest.
Many of those protests passed peacefully but, elsewhere, hundreds of masked people took to the streets and violence followed.
But how did so many people mobilise so quickly and what role did social media play in the organisation? BBC News NI takes a look at how a violent attack led to days of disorder.
Northern Ireland has seen three nights of violence after footage of a knife attack on Monday night spread across social media.
www.bbc.com