A copy of the Al Qaeda magazine Inspire has been discovered in Guantanamo prison after being after being smuggled through to a detainee, according to reports.
Agence France-Presse reported that the find came amid a debate on new rules on mail inspections.
The Associated Press reported that the terror group's Yemeni offshoot, Al Qaeda of the Arabian Peninsula, launched the English-language magazine in 2010, and that an early issue contained tips to would-be militants about how to kill US citizens.
According to AFP, deputy military prosecutor Andrea Lockhart told a military tribunal hearing that the version found included such articles as how to make bombs.
She did not specify how the magazine, which is published by the Al-Qaeda in the Arabian Peninsula, was smuggled into the remote US base in southern Cuba nor whether it was discovered during a search of the cells.
But Lockhart said new rules on inspecting the mail between lawyers and detainees were brought in on December 27 after its discovery.
Lawyers for Guantanamo inmates claim the new mail rules are a violation of their clients' rights.
The detention center, which turned 10 this month, houses 171 "enemy combatants" detained in the US "war on terror" launched after the 9/11 attacks.
Some of them have been held at Guantanamo since the jail was opened.
The discussion of the mail rules came about during a preliminary hearing into the trial of Abd al-Rahim al-Nashiri, a Saudi national charged with leading the attack on the USS Cole in the Yemeni port of Aden in 2000 that killed 17 sailors.
According to the AP:
Al-Nashiri, 47, is considered one of the most senior Al Qaeda leaders. He has been held at the US Naval Base at Guantanamo Bay, Cuba, since 2006 after spending several years held by the CIA in a series of secret prisons.