Baghdad Car Bomb: Worst Attack on the City in Years

We hear from Baghdad where Islamic State militants have claimed responsibility for the blast which went off in the Shia Muslim district of Sadr City. Also in the programme, reaction to Queen Elizabeth's leaked comments on "very rude" Chinese officials and the British Prime Minister's description of Nigeria and Afghanistan as "fantastically corrupt". And the scientists exploring the deepest place on Earth, the Mariana Trench, tell us what they've been discovering on their expedition.

( Image: Security forces and citizens inspect the scene after a car bombed exploded at a crowded outdoor market. Credit: AP Photo/ Khalid Mohammed)