The Lari massacre was an incident during the Mau Mau Uprising where the Mau Mau massacred troops from the loyalist Home Guard and their families, including prominent local royalist Luki.
British colonial government used the attack as propaganda event and showed the massacre to journalists. The massacre prompted retaliatory attacks. In revenge, British and African soldiers killed at least 400 Mau Mau.
References
Lari massacre Wikipedia(Text) CC BY-SA