Conjoined twins Hasan and Hussein, accompanied by their mother, have arrived at King Khaled International Airport in Riyadh from Dar es Salaam, Tanzania, on a Medevac plane, upon the directives of the Custodian of the Two Holy Mosques, King Salman bin Abdulaziz Al Saud, and Prince Mohammed bin Salman bin Abdulaziz Al Saud, Crown Prince and Prime Minister.