An Afghan prisoner was found dead at Guantanamo on Wednesday, having apparently committed suicide, the U.S. military has said. The prisoner, a 37-year-old man known as Inayatullah, is believed to be the sixth suicide at Guantanamo since the military began detaining suspected terrorists there in January 2002.

The details of Inayatullah's death aren't yet clear--The Guardian says he was found dead in a recreation yard, while Politico says he was found in his cell. The Associated Press report says "the military would not immediately disclose any details about the circumstances of the death, including the method of the apparent suicide or in which section of Guantanamo the prisoner was detained."

We do know that Inayatullah had confessed to planning operations for al Qaeda, and that he had "attested to facilitating the movement of foreign fighters, significantly contributing to transnational terrorism across multiple borders," according to a military statement. The statement also says that "Inayatullah met with local operatives, developed travel routes and coordinated documentation, accommodation and vehicles for smuggling Al Qaida belligerents through Afghanistan, Iran, Pakistan and Iraq."

Inayatullah was imprisoned at Guantanamo in September 2007 and has been held there, without charge, ever since. Politico notes that "of the detainee deaths since the facility first opened as a detainment center in January 2002, five were ruled suicides, while two other people died of natural causes."