Investigators say the ring involved three gangs based in the city of Minneapolis - the Somali Outlaws, the Somali Mafia and the Lady Outlaws.

BBC: Somalis accused over US child sex trafficking ring

It was a bold pledge by a senior police officer that within three years, street gangs in the West Midlands would be eradicated.

BBC: Birmingham street gang eradication in 2013 'unrealistic'

All three major candidates have vowed to continue to fight drug gangs, but focus more on reducing violence than seizing drugs or arresting cartel leaders.

WSJ: Mexico Drug Violence Shows Decline

It was quite a melee at Harrah's Laughlin, Nev. casino in late April, when rival biker gangs got into a violent brawl that left three dead.

FORBES: The Big Nasty

Tonight I propose a three-year initiative to help organizations keep young people out of gangs, and show young men an ideal of manhood that respects women and rejects violence.

CNN: Transcript of State of the Union

At least three people are confirmed dead but a local newspaper journalist told the BBC by phone the rival gangs had removed their fallen comrades from the streets.

BBC: Mexico gang violence displaces thousands in Michoacan

Three years ago, it was rated one of the worst schools in Colorado, located on turf between two rival gangs.

CNN: Transcript: Obama's State of the Union speech