evidence: The Islamic State leader, Abu Bakr al-Baghdadi, has been killed in a raid by US special forces on his Syrian safe house, Donald Trump has announced, ending a years-long hunt for one of the world’s most-wanted terrorists. [...] Trump said US forces were engaged with "massive firepower" as their helicopters arrived at the building where Baghdadi was sheltering with his family and associates. [...] Trump said Baghdadi was "the biggest there is", casting the operation as the US’s greatest counter-terrorism feat, greater even than the killing of the al-Qaida leader, Osama Bin Laden, under his predecessor, Barack Obama.