<P> The flag of South Korea (Taegeukgi) is flown at half - mast on Hyeonchungil (Korean Memorial Day). </P> <P> The flag of Sri Lanka is nationally flown at half - mast on a National day of mourning . </P> <P> The flag of the Republic of China is flown at half - mast on February 28 to mark the anniversary of the February 28 Incident . On 5 August 2014, Taiwan flew their flag in half - mast for three days to commemorate the victims of the Kaohsiung gas explosions and TransAsia Airways Flight 222 crash . </P> <P> The flag of Thailand was flown at half - mast for 15 days to mourn for the victims of 2004 Indian Ocean earthquake and tsunami . </P>

When is flag to be flown at half mast