ISLAMABAD, Pakistan - One is believed to be a chemical weapons expert, another allegedly plotted assassinations. A third planned attacks targeting U.S. troops, while a son-in-law publicized their exploits in the name of al-Qaida and recruited new militants. Now this top group is believed to have been wiped out by a U.S. missile strike. If true, it's far from a death blow to al-Qaida, but analysts say it could weaken the terror group's operations in Afghanistan, which has seen an alarming rise in suicide attacks. The strike apparently missed al-Qaida's second-in-command, Ayman al-Zawahri. And an audiotape aired Thursday, the first...