A huge search is underway for the killer of the influential conservative US activist and ally of President Trump, Charlie Kirk. We hear from our correspondent at the university campus in Utah where the shooting happened. Also: Britain's prime minister has sacked the UK ambassador to Washington, Peter Mandelson, over his ties to the late convicted paedophile, Jeffery Epstein; a BBC investigation has revealed the scale of an international charity’s involvement in the systematic disappearance of children during former Syrian President Bashar al-Assad's regime, and the dark DNA that could explain the extraordinary dancing peacock spider.