Saudi princes among dozens detained in anti-corruption purge
The heir to the throne in Saudi Arabia has consolidated his hold on power with a major purge of the kingdom's political and business leadership.
A new anti-corruption body, headed by Crown Prince Mohammed bin Salman, detained 11 princes, four sitting ministers and dozens of ex-ministers.
Prince Alwaleed bin Talal, a billionaire with investments in Twitter and Apple, is among those held.
Separately King Salman replaced the national guard and the navy chiefs.
The new anti-corruption committee has the power to issue arrest warrants and travel bans.
Saudi broadcaster Al-Arabiya said fresh investigations had been launched into the 2009 Jeddah floods and the outbreak of the Mers virus which emerged in Saudi Arabia in 2012 – but analysts see the detentions as a clear move by the crown prince to strengthen his power base.
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A shock to Saudis unused to change
Analysis by Frank Gardner, BBC security correspondent
The events of Saturday night in Saudi Arabia are nothing short of seismic for that country. In a bold, pre-planned move, the 32-year old Crown Prince has removed the final obstacles to his gaining total control over the world's richest oil producer and home to the holiest shrines in Islam.
Presented to the world as an anti-corruption drive, the arrests of princes, ministers and the billionaire tycoon Prince Alwaleed bin Talal have shocked Saudis unused to sudden change.
The crown prince is largely popular, especially amongst young Saudis, but many older, more conservative citizens think he is moving too far too fast. He has started an unwinnable war in Yemen while still fighting the extremists of so-called Islamic State. He has also backed a damaging boycott of Gulf neighbour Qatar.
But his supporters hail his efforts to modernise Saudi Arabia and, after decades of rule by old men, they welcome a fresh vision from a man who could well be king for the next 50 years.
Who is Prince Alwaleed?
Prince Alwaleed, who owns London's Savoy hotel, is one of the richest men in the world, with a net worth of $17bn (£13bn) according to Forbes.
Shares in Kingdom Holding, the investment firm owned by the prince, plunged 9.9% in early trade on the Saudi stock market after news of his detention emerged.
The firm is one of Saudi Arabia's most important investors. Apart from Twitter and Apple, it has shares in Rupert Murdoch's News Corporation, Citigroup bank, the Four Seasons hotel chain and ride-sharing service Lyft.
Prince Alwaleed once bought control of a hotel and a yacht from Donald Trump, when he had yet to enter politics, but clashed with him publicly on Twitter in 2015 over his decision to stand for president, the New York Times notes.
Skip Twitter post by @Alwaleed_Talal
You are a disgrace not only to the GOP but to all America.
Withdraw from the U.S presidential race as you will never win.
— الوليد بن طلال (@Alwaleed_Talal) December 11, 2015
End of Twitter post by @Alwaleed_Talal
M Trump, who was born into a family of property developers, shot back with a tweet mocking the source of the prince's wealth.
Skip Twitter post by @realDonaldTrump
Dopey Prince @Alwaleed_Talal wants to control our U.S. politicians with daddy’s money. Can’t do it when I get elected. #Trump2016
— Donald J. Trump (@realDonaldTrump) December 12, 2015
End of Twitter post by @realDonaldTrump
Who else was detained or sacked?
The names of the other figures who were detained could not be verified immediately.
National guard minister Prince Miteb bin Abdullah and navy commander Admiral Abdullah bin Sultan bin Mohammed Al-Sultan were both replaced, with no official explanation given.
Prince Miteb, son of the late King Abdullah, was once seen as a contender for the throne and was the last member of Abdullah's branch of the family at the highest echelons of Saudi government.
What do we know about Crown Prince Mohammed?
Few people outside Saudi Arabia had heard of Prince Mohammed bin Salman before his father became king in 2015. But since then, the 32-year-old has become the most influential figure in the world's leading oil exporter
Last year, Prince Mohammed unveiled a wide-ranging plan to bring social and economic change to the oil-dependent kingdom.
He recently said the return of "moderate Islam" was key to his plans to modernise Saudi Arabia.
Addressing an economic conference in Riyadh, he vowed to "eradicate the remnants of extremism very soon".