US Democratic frontrunners clash in TV debate

Three frontrunners in the race to become the Democratic Party's candidate for US president have clashed over healthcare at the party's third debate. The debate in Houston, Texas, was the first time Joe Biden, Elizabeth Warren and Bernie Sanders faced off on stage. Former Texas lawmaker Beto O'Rourke drew some of the biggest applause with an impassioned plea for gun control.

Also in the programme: The world's first malaria vaccine is being rolled out in Kenya; and a new retrospective on the work of William Blake, one of Britain's most celebrated artists and poets, opens at the Tate Britain.

Image: The top Democratic presidential hopefuls on the debate stage. Credit: Robyn Beck/AFP/Getty Images)