
LONDON, June 21, 2016 (Xinhua) -- Britain's Prime Minister David Cameron leaves after delivering a speech on upcoming referendum on Britain's EU membership at 10 Downing Street in London, Britain on June 21, 2016. (Xinhua/Han Yan)

LONDON, June 21, 2016 (Xinhua) -- Britain's Prime Minister David Cameron leaves after delivering a speech on upcoming referendum on Britain's EU membership at 10 Downing Street in London, Britain on June 21, 2016. (Xinhua/Han Yan)