Calls for crackdown on gangs in South Africa after spate of gun attacks

Attack on tavern near Johannesburg in which 15 were killed was one of several similar incidents over the weekend

Campaigners in South Africa have called for a crackdown on increasingly powerful organised criminals armed with military-grade weapons, blamed for a string of recent deadly attacks.

Police are looking for suspected gang members who killed 15 people in a tavern near Johannesburg, the country's commercial capital, using an assault rifle and 9mm pistols on Saturday night.