AN Arab prince has been found dead in his London home amid claims of a drug-fuelled orgy.

Staff discovered the body of Sheik Khalid bin Sultan Al Qasim, 39, at his Knightsbridge penthouse on Monday morning.

9 Staff discovered the body of Sheik Khalid bin Sultan Al Qasim, 39, seen here with model Alice Delal in 2009, at his penthouse on Monday morning Credit: Getty - Contributor

9 A source said: 'It is suspected that Sheik Khalid may have died suddenly as a result of taking drugs' Credit: Getty - Contributor

An ambulance called police who are said to have found a quantity of Class A drugs.

A source said: “There had apparently been a party where some guests were taking drugs and having sex. It is suspected that Sheik Khalid may have died suddenly as a result of taking drugs. As well as the police inquiry, an urgent internal probe has been ordered and staff have been ordered to keep quiet.”

Sheik Khalid’s father is the ruler of oil-rich Sharjah, the third biggest city in the United Arab Emirates.

The family own a country estate in Sussex — where Sheik Khalid’s older brother was found dead from a heroin overdose in 1999. He was 24.

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Detectives are treating the new tragedy as “unexplained” and have made no arrests.

His father announced three days of official mourning with the words that Sheik Khalid “is in the care of God”.

His sole surviving son and heir was a fashion designer and co-owner of upmarket label Qasimi. Celebrity fans include Lady Gaga and Cheryl Tweedy.

He had studied architecture and was an award-winning photographer.

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The source said: “Like many young Arab men, Sheik Khalid enjoyed the freedoms he had in London. But it has ended very tragically.”

The Knightsbridge Apartments development where he died has 205 stunning homes across 12 floors, selling for up to £90million each.

Last night close friend and former business partner Elliott Frieze said: “He was incredibly hard working and talented. He was a wonderful person.”

9 Al Qasimi with model Erin O'Connor on the catwalk at the Qasimi Spring Summer 2009 show at London Fashion Week Credit: Alpha Press

9 Al Qasimi, second left, next to model Erin O'Connor on the catwalk at the Qasimi Spring Summer 2009 show at London Fashion Week Credit: Alpha Press

9 Prince Khalid Al Qasimi's father Sheikh Dr Sultan bin Muhammad Al Qasimi Credit: Getty - Contributor

9 Designer Khalid Al Qasimi walks the runway at the Qasimi show during London Fashion Week Credit: Getty - Contributor

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9 The Prince's death was announced by his family on social media Credit: Twitter