Police officers watch as a convoy carrying members of the British media leaves the British Embassy in Tehran, Iran August 23, 2015. Britain reopened its embassy in Tehran on Sunday, nearly four years after protesters ransacked the ambassador's residence and burned the Union Jack. In a signal of the most striking thaw in Western ties with Iran for over a decade, Foreign Secretary Philip Hammond watched the British flag being raised in the garden of the opulent 19th century building while the national anthem played. REUTERS/Darren Staples