A crown prince from the United Arab Emirates has died in London, the country's authorities have announced.
Sheikh Khalid bin Sultan Al Qasimi died on Monday aged 39, but further details are unclear.
Son of the ruler of the emirate of Sharjah, he had worked as a designer at fashion label Qasimi.
Three days of national mourning have been declared in the UAE, where funeral prayers are expected to be held on Wednesday.
His father, Sheikh Dr Sultan bin Muhammad Al Qasimi, has ruled Sharjah since 1972. He expressed his sorrow in an Instagram post, saying his son was "in the care of God".
In a statement, the fashion label said the crown prince had died "unexpectedly" but did not provide further information on his death.
According to the eponymous fashion label, he had studied fashion design at Central Saint Martins in London, and released his first collections in 2008
The Qasimis are one of six ruling families in the country, and rule both the Sharjah and Ras Al Khaimah emirates.