A missile attack from a remotely piloted American aircraft is believed to have killed a senior member of al-Qaeda in South Waziristan on Thursday, a former member of a militant group in the region said in an interview. The operative, Khalid Habib, an Egyptian who was chief of operations in Pakistan’s tribal region, is described by the CIA as the fourth-ranking person in the Qaeda hierarchy. The attack, on the village of Taparghai, killed four people, some of them Arabs, according to initial reports on Thursday. A Pakistani intelligence official declined on Friday to confirm the death of Habib. An...