A detainee being held in the Gulf island kingdom of Bahrain has died while in custody, authorities announced Sunday.

The Ministry of Interior said in a statement that the unidentified detainee died of natural causes after being taken to the Salmaniya Medical Complex. It gave no further details on the circumstances of his death other than that he was suffering from an unspecified "medical condition" and had been referred to a doctor. Questions sent to the ministry seeking clarification went unanswered.

Bahrain's Sunni-led government has faced years of low-level unrest following its crushing of a 2011 Arab Spring-inspired uprising led by the country's Shiite majority. Authorities have intensified a crackdown on political opponents and activists in recent weeks, and earlier this month ordered the country's main Shiite opposition group, al-Wefaq, to be dissolved.

Opposition activists and rights groups have previously alleged that some detainees face torture in the country, which hosts the U.S. Navy's 5th Fleet. The government says it is opposed to any kind of mistreatment.

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