I'm doing a phd in chemistry flagyl for purchase The al-Qaeda affiliate announced in July that its second-in-command, Shihri, a former Guantánamo Bay prisoner, had died as a result of injuries sustained in an American missile strike in Yemen last year. But Ibrahim Hassan al-Asiri, the group's seminal bomb maker, remains at large, and, according to American officials, has trained a cadre of skilled protégés ready to take his place should he be killed.