<Li> On the death of a former Deputy Prime Minister, Toh Chin Chye, who was cremated on 7 February 2012 . </Li> <Li> On the death of the first Prime Minister, Lee Kuan Yew, who died on 23 March 2015 . </Li> <Li> On the death of 7 pupils, 1 teacher and a guide from Tanjong Katong Primary School due to 2015 Sabah earthquake . </Li> <Li> On the death of the sixth President of Singapore, S.R. Nathan, who died on 22 August 2016 . </Li>

Who decides to fly flags at half staff