File photo - Saudi Arabia's new Defence Minister Prince Mohammed bin Salman bin Abdelaziz Al Saud, born in 1980 (probably the world's youngest minister of Defence) seen in a photo released by Royal Palace, on January 23, 2015. Saudi Arabia's king has appointed his son Mohammed bin Salman as crown prince - replacing his nephew, Mohammed bin Nayef, as first in line to the throne. Prince Mohammed bin Nayef, 57, has been removed from his role as head of domestic security, state media say. Photo by Balkis Press/ABACAPRESS.COM