The week around the world in 20 pictures

Former US president Barack Obama departs the stage after speaking on the second day of the Democratic National Convention at the United Center in Chicago. ‘We do not need four more years of bluster and bumbling and chaos,’ he told delegates. ‘We have seen that movie before and we all know that the sequel is usually worse. America is ready for a new chapter. America is ready for a better story. We are ready for a President Kamala Harris.’