Fifty years ago, the black civil rights activist Martin Luther King was fatally shot on the balcony of a motel in Memphis, Tennessee. As news of his assassination spread, African Americans poured onto the streets in rage. Our correspondents Philip Crowther and Sonia Dridi have been speaking to some of those who remember the nights of unrest, clashes and looting that took place in Washington, DC. Also, it's often referred to as the "beautiful game". But the sport of football has turned ugly in Argentina. The club River Plate says it will now cooperate with any probe into allegations that its junior players were sexually abused. A lawyer for the charity Help for Rape Victims says a former doctor had informed them that some boys had been abused between 2004 and 2011.

Finally, scientists from Chile have been busy looking at climate change in Antarctica. They've been studying how rising temperatures and sea levels have impacted glaciers, while putting forward solutions to help future generations who look set to be affected by the melting ice.