london mayor london sadiq khan call british government wednesday make formal apology 1919 jallianwala bagh massacre nearly 400 sikhs shoot dead british indian army soldier visit golden temple amritsar northern india important pilgrimage site sikhism khan call massacre one horrific events indian history sunday 13 april 1919 50 soldier begin shoot unarm civilians take part peaceful protest oppressive laws enforce punjab british colonial authorities least 379 sikhs kill figure still dispute wrong successive british governments fall short deliver formal apology families kill say clear government apologize especially reach centenary massacre properly acknowledge happen give people amritsar india closure need formal apology khan opposition labour party speak britain conservative government former conservative prime minister david cameron visit amritsar end trade mission india four years ago show contrition massacre stop short make formal apology khan six-day mission india pakistan strengthen cultural economic tie british capital british foreign office say statement former prime minister say visit jallianwala bagh 2013 massacre deeply shameful act british history one never forget right pay respect lose live remember happen british government rightly condemn events time london mayor call uk apology colonial-era massacre india