Pakistan People Party (PPP), Sindh will observe July 5, as "Black Day", as on this day the elected government of former prime minister, Shaheed Zulfikar Ali Bhutto was toppled by Zia-ul-Haq, and imposed martial law in 1977. Sindh Chief Minister, Syed Qaim Ali Shah, who is also the President PPP Sindh has directed all district presidents of the party to observe July 5 as Black Day and arrange rallies, said a statement issued by the Peoples Secretariat, Sindh here on Saturday.