Evidence mounts that the brothers may be involved in an unsolved triple murder in Waltham, Massachusetts, United States from September 11, 2011 - one of the victims, Brendan Mess, was once a roommate of Tamerlan. (ABC News)
A Guatemala court finds former military leader Efraín Ríos Montt guilty of genocide and crimes against humanity and sentences him to 80 years in prison. (BBC)