[Maghrebia] Mauritanian officials arrested two young men Thursday (June 25th) in Nouakchott as part of their investigation into the murder of American aid worker Christopher Leggett, PANA reported. Leggett, a computer teacher and NGO worker in the El Kasr neighbourhood of Nouakchott, was shot and killed by two unidentified assailants on Tuesday. In a statement aired Wednesday night on Qatari satellite TV channel Aljazeera, al-Qaeda claimed responsibility for the murder.