Saudi Arabia king appointed his son as crown prince, replacing his nephew

<p style="line-height: 18.5714px;"><span style="line-height: 18.5714px;">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.</span><br></p><p style="line-height: 18.5714px;">King Salman's decree also means Prince Mohammed bin Salman, 31, will become deputy prime minister while continuing as defence minister.</p><p style="line-height: 18.5714px;">Prince Mohammed bin Nayef, 57, has been removed from his role as head of domestic security, state media say.</p><p style="line-height: 18.5714px;">He has pledged allegiance to the new crown prince, news agency SPA reports.</p><p style="line-height: 18.5714px;">Saudi Arabia has typically been ruled by kings in their 70s or 80s.</p>