Mohamedou Ould Slahi–Abu Hafs kinship

The Mohamedou Ould Slahi–Abu Hafs kinship combined a distant cousinship with a connection created by marriage, placing an ordinary family tie alongside a consequential political association. Mahfouz Ould al-Walid, known as Abu Hafs, was related to Slahi by blood and was also the brother-in-law of Slahi’s former wife; their occasional contact and financial assistance to Abu Hafs’s family later gave that kinship particular significance in the account of Slahi’s life and security scrutiny.

A Relationship Through Blood and Marriage

Slahi and Mahfouz Ould al-Walid were distant cousins. Their families were linked again through marriage: Abu Hafs married the sister of Slahi’s former wife, making him Slahi’s brother-in-law through that marriage as well. The overlapping ties matter because the relationship was not simply an association formed in a political circle; it was embedded in a wider family network.

The connection sat within Slahi’s own family responsibilities. Born into a large family, he lost his father not long after the family moved to Nouakchott, and later described having many relatives to support. This context makes it important to distinguish the kinship itself from the different acts conducted through it: family relationship, occasional communication, and money transfers are documented, but they are not interchangeable evidence of political allegiance.

Contact and Financial Assistance in Germany

After his involvement in the Afghan conflict, Slahi returned to Germany, completed an electrical-engineering degree at the University of Duisburg, and lived and worked in Duisburg with his Mauritanian wife for much of the 1990s. He remained in touch with some companions from Afghanistan, including people who retained al-Qaeda ties, and also had occasional telephone contact with Abu Hafs.

One call drew particular attention: in 1999, German intelligence detected a call from Abu Hafs made using Osama bin Laden’s satellite phone. The account identifies the call as evidence of contact, not as proof of what Slahi and Abu Hafs discussed or of Slahi’s participation in an operation. Separately, Slahi helped Abu Hafs transfer $4,000 to Abu Hafs’s family in Mauritania on two occasions around Ramadan. Those transfers give the relationship a concrete practical dimension, while the evidence does not describe them as payments to Slahi or as support for an attack.

Political Significance and the Limits of the Evidence

Abu Hafs was a prominent member of al-Qaeda’s Shura Council, its principal advisory body, during the 1990s and until the September 11 attacks. He also served as one of Osama bin Laden’s senior theological advisers. Slahi’s family tie therefore connected him to a figure with a high position in the organization, even as the documented acts between the two men remain specific: occasional calls and assistance in transferring money to Abu Hafs’s relatives.

Slahi maintained that his commitment to al-Qaeda ended after his Afghan experience. In his account, he had understood the fighting there as a struggle alongside fellow Muslims against communists, and rejected the organization’s later turn toward jihad against the United States. The existence of kinship and contact must be read beside that stated distinction: the relationship establishes a real personal connection, but does not alone resolve the separate question of Slahi’s political commitment or conduct.

Abu Hafs After September 11

Accounts cited in the book report that Abu Hafs opposed the September 11 attacks; the 9/11 Commission recorded a report that he had written Osama bin Laden a message arguing against the attacks on Qur’anic grounds. This reported opposition complicates any simple assumption that family contact with Abu Hafs necessarily meant agreement with every al-Qaeda action.

Abu Hafs left Afghanistan after the attacks and spent the following decade under house arrest in Iran. In April 2012 he was extradited to Mauritania, held briefly, and released. His later trajectory underscores the difference between the two men’s circumstances: Abu Hafs was a senior organizational figure who became a free man, while Slahi remained imprisoned at Guantanamo. Their kinship persisted as a family fact across sharply different political and legal outcomes.