SAN'A, Yemen — U.S. fighter jets have patrolled Yemen's northern border with Saudi Arabia as Yemeni forces hunt for Al Qaeda operatives, a security official said Saturday. The official, speaking on condition of anonymity, said U.S. jets were patrolling the border provinces of Marib and Jawf, strongholds of Muslim militants where the Al Qaeda terror group is believed to be active. The official said operations were designed to "tighten the grip on Al Qaeda suspects who are believed to be relocating in these tribal strongholds in the wake of the latest U.S. attack." Tribal leaders in the region said Americans...