Pakistan's security forces say they have captured the leader of the Afghan militant group which kidnapped three United Nations workers in late October. Syed Mohammad Akbar Agha, the head of the Army of Muslims, was captured ten days ago in a raid in the southern port city of Karachi. His detention was not disclosed earlier to prevent other members of the group from escaping. However, the Pakistani authorities did not say whether other militants have been arrested since. The three UN workers--a man from the Philippines, and two women from Kosovo and Northern Ireland--were abducted in late October in the...