The inmates responsible for the killings of 56 rivals at a prison in the Amazon will be transferred to high-security federal institutions as well as being prosecuted, according to authorities in Brazil.

The prime suspect in the brutal massacre of 11 members of a Mexican family is an alleged rapist seeking revenge against a victim who landed him in jail.

The man charged with killing nine black parishioners last year in a US church should face the death penalty, Attorney General Loretta Lynch said.

The man who bought the assault rifles used by his friend in the San Bernardino massacre has been charged with terrorism-related offences for plotting an earlier attack that was aborted.

Pakistan hanged four convicted militants who were sentenced to death over a Taliban attack on an army-run school last year that killed more than 150 people, mostly children, officials said.

An 18-year-old was stopped at the last minute from carrying out a gun and bomb attack on a college in Newcastle last year, a court has heard.

Two decades after the massacre at Srebrenica, Gwynne Dyer reports on how Serbia and its people, with some exceptions, refuse to accept it was an act of genocide

Eight people are in custody on suspicion of direct links to a deadly attack on a Tunisian beach resort, while police have released four others detained earlier in the investigation.

Tunisia has made its first arrests over the massacre of 38 people, including three Irish tourists, by a gunman in Sousse on Friday.

A white man suspected of killing nine people in a Bible study group at a historic black church in Charleston, South Carolina, was arrested yesterday. Officials are investigating the attack as a hate crime.

Prosecutors have made Serbia’s first arrests of people suspected of the Srebrenica massacre killings.

Almost three years ago, Anders Breivik committed the worst mass shooting in living memory, killing 77 people in Norway.