Authorities in Bahrain say a detainee has died while in custody.

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.

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.

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