Republican presidential hopeful Ted Cruz brands his rival Donald Trump "a pathological liar" after the front-runner suggested Mr Cruz's father was linked to JFK's assassin.
The US defence secretary accuses Russia of "nuclear sabre-rattling" and says the US has had to step up its military presence on Nato's eastern flank.
A couple in north-western Germany used dating adverts to lure two women to their home then tortured them to death, police say.
Ted Cruz had aimed to stop Donald Trump at Indiana
BBC visits Azerbaijan's side of frontline in Karabakh conflict
Bottling water for profit in drought-hit California
World reaction and (mis)pronunciation
China's army launches big-budget rap recruitment video
Searching for self-reliance and 'real locals' in Pyongyang