The burial ceremony will take place upon the repatriation of his body and the funeral will be limited to a specific number of relatives, the statement said.
Official mourning has been declared for a week. Government ministries and departments will be closed for three days starting Thursday.
Khalifa Bin Salman has served as the Prime Minister of Bahrain since 1970, taking office over a year before Bahrain's independence on August 15, 1971. He was the longest-serving current Prime Minister of any government in the world.