Britain's Prime Minister David Cameron (C) poses inside the premises of the holy Sikh shrine the Golden temple in the northern Indian city of Amritsar February 20, 2013. Cameron on Wednesday became the first serving prime minister to voice regret about one of the British Empire's bloodiest episodes in India, the Jallianwala Bagh massacre, and laid a wreath at Amritsar, scene of a notorious massacre of unarmed civilians.[Photo/Agencies]