After the September 2013 terrorist attack on Westgate Mall in Nairobi, Ole Lenku spearheaded the Nyumba Kumi (ten households) security initiative aimed at bringing to the door step of individual citizens the mandate to ensure their own safety by knowing a few things about their neighbours as a security strategy to contain insecurity. On 7 October 2013, he announced that the government was working on a framework to put in place the Nyumba Kumi initiative across the country. He asked all County Commissioners to embark on its implementation to ensure security is enhanced in most parts of the country. In the same month, he unveiled a committee headed by a former provincial administrator, Joseph Kaguthi, to oversee the implementation of the Nyumba Kumi initiative that requires Kenyans to know at least ten households within their neighbourhood as a way of fighting crime.