All praise be to Allaah, and peace and blessings be upon the Messenger of Allaah, his family, his Companions, and those who follow his guidance.
There is, in the present time, a tradition in many Islaamic countries that when a king or a leader dies, people must mourn for three days or more or less. Flags are lowered at half-mast and the State departments stop working. Undoubtedly, these acts go against Sharee`ah (Islaamic law) and entail imitation of the enemies of Islaam. Authentic Hadeeths related from the Prophet (peace be upon him) prohibit and warn people, except a wife, against mourning. The maximum period of mourning for a woman is four months and ten days, if the deceased is her husband, and three days or less for relatives… read more here.
Note: This topic was published in the Islaamic Research Journal, the ninth edition issued for the period of Rabee` Al-Awwal and Jumaada Al-Thaanee in 1404 A.H.