Hand grenade explodes on Iranian football pitch
Muhammad Ali receives prestigious Liberty Award
Amazing footless footballer causes a stir in Rio
Skateboarders try out giant ramp in Brazil
World's fastest man: Usain Bolt celebrates his 26th birthday
Olympic closing ceremony plays out on a high note
No golden goal for Man Utd NY share debut
German drops nearly 200kg on neck at Olympics 2012 weightlifting
Olympics "gatecrasher" Madhura Nagendra apologises