Sheikh Khalifa bin Salman al-Khalifa, the Prime Minister of Bahrain passed away Wednesday morning at Mayo Clinic Hospital in the US, the official Bahrain News Agency said Wednesday.The burial ceremony will take place after the repatriation of the body, and the funeral will be limited to a specific number of relatives.King Hamad bin Isa Al Khalifa has ordered an official mourning for a week during which flags will be flown at half-mast, the news agency said. Government ministries and departments will be closed for three days starting Thursday.