Venezuela's opposition leader, Maria Corina Machado, has turned up at a mass rally in Caracas, defying government calls for her arrest. Also in the programme: there has been international condemnation after an attack in Somalia's capital Mogadishu. At least 37 people were killed on Friday in a suicide attack carried out by al-Shabab militants; and the US rock band Aerosmith have announced their immediate retirement from touring due to Steven Tyler's vocal injury. (Photo: Venezuelan opposition leader Maria Corina Machado attends a protest in Caracas. Credit: REUTERS/Leonardo Fernandez Viloria)