(Ahlul Bayt News Agency) - Younis al-Mauritani was arrested in south-western Pakistani city of Quetta in 2011 along with two other high-ranking fake jihadists in a joint operation by US and Pakistani spy agencies.
He was jailed on Monday in a closed hearing in the Mauritanian capital Nouakchott, a judicial source who requested anonymity said.
Mauritani's arrest was seen as huge blow to the global terror network, four months after Al Qaeda chief Osama bin Laden was killed in Pakistan by covert US forces.
Pakistan's army said Mauritani was instructed by bin Laden to focus on economic targets in the United States, Europe and Australia.
"He was planning to target United States economic interests including gas/oil pipelines, power generating dams and strike ships/oil tankers through explosive-laden speed boats in international waters," the army said after his arrest.
Western intelligence officials from two separate countries confirmed Mauritani was part of Al Qaeda's top team and linked to threats against Europe, and he was extradited to Mauritania in May 2013.
Mauritanian authorities had issued an international warrant for his arrest, accusing him of participating in a deadly 2005 attack on an army barracks and a shootout with police in Nouakchott in 2008.
Kidnappings and attacks by Al Qaeda in Maghreb (AQIM) were frequent when Mauritania's president Mohamed Ould Abdel Aziz came to power in 2008.
But Mr Aziz claims that he has turned his nation into a regional haven of peace thanks to his reorganization of the military and security forces.
In 2010 and 2011, Mauritanian troops carried out successful "preventative" raids on AQIM bases in neighboring Mali, before the armed fundamentalists could carry out planned attacks on Mauritania.