Dallas police shooting: echoes of Isil tactics in black militant’s online ‘self radicalisation’

It sounds like a terrorist rallying cry from al-Qaeda or Isil: “Kill the pigs who kill our kids!”

Yet this call for the murder of police officers was the slogan chanted by Malik Shabazz, the then leader of the New Black Panther Party, at a protest 20 years ago.

Black extremist groups are nothing new in America. They rose to prominence in the mid-1960s as an alternative to the non-violent stance of the civil rights leader Martin Luther King Jr, but in recent years they have found a new, more powerful tool than mass rallies: social media and the internet.