Mau Mau Uprising attempt to eliminate Mau Mau's presence within Nairobi in one fell swoop. 25,000 members of British security forces under the control of General George Erskine were deployed as Nairobi was sealed off and underwent a sector-by-sector purge. All native Kenyans were taken to temporary barbed-wire enclosures, whereafter those who were not Kikuyu, Embu or Meru were released; those who were remained in detention for screening. Whilst the operation itself was conducted by Europeans, most suspected members of Mau Mau were picked out of groups of the Kikuyu-Embu-Meru detainees by a native Kenyan informer. Male suspects were then taken off for
Mau Mau Uprising night of 25–26 March 1953, in which they herded men, women and children into huts and set fire to them, hacking down with machetes anyone who attempted escape, before throwing them back into the burning huts. The attack at Lari was so extreme that "African policemen who saw the bodies of the victims were physically sick and said 'These people are animals. If I see one now I shall shoot with the greatest eagerness, and it "even shocked many Mau Mau supporters, some of whom would subsequently try to excuse the attack as 'a mistake. A retaliatory massacre was immediately