Hosts: Rio de Janeiro Dates: 5-21 August Rio time: BST -4  Coverage: Watch on BBC One, BBC Two, BBC Four, Red Button and up to 24 HD video streams on mobile, desktop, connected TVs and app, plus follow on Radio 5 live and via live text commentary.  Vietnam claimed their first ever Olympic gold as Vinh Xuan Hoang won the men's 10m air pistol title.  Hoang scored 202.5 points to edge…

An Iranian nuclear scientist detained since 2010 has been executed, his family has told the BBC.  Shahram Amiri's mother said the body of her son had been returned to their hometown with rope marks around his neck, showing that he had been hanged.  He was later buried. Amiri had been held at a secret location after returning from the US, where he said he had been forcibly taken by the…