A son of the ruler of Sharjah in the United Arab Emirates has died in London, officials have announced.

Axar.az reports citing BBC.

Sheikh Khalid bin Sultan Al Qasimi died on Monday. London police say his death is being treated as unexplained.

The 39-year-old had forged a career for himself as a fashion designer. Clothes from his label, Qasimi, were shown at London Fashion Week.

Funeral prayers were held on Wednesday morning in the UAE, where three days of national mourning have been declared.

His father, Sheikh Sultan bin Mohammed Al Qasimi, has ruled Sharjah since 1972. He expressed his sorrow in an Instagram post on Tuesday, saying his son was "in the care of God".

The President of the UAE and ruler of Abu Dhabi, Sheikh Khalifa bin Zayed Al Nahyan, offered his condolences to Sheikh Sultan and his family.

In a statement, the fashion label Qasimi said the sheikh had died "unexpectedly" but did not provide further information.

Police said they had received a report of "a sudden death at a residential property in Knightsbridge".

A post-mortem examination was carried out on Tuesday but proved inconclusive, and they were awaiting the result of further tests, the police statement added.