Pakistani villagers offer funeral prayers for people who were reportedly killed by a U.S. drone attack in Miranshah, capital of Pakistani tribal region of North Waziristan along the Afghanistan border. UNITED NATIONS — A U.N. expert on Thursday launched a special investigation into drone warfare and targeted killings, which the United States relies on as a front-line weapon in its global war against al-Qaida. One of the three countries requesting the investigation was Pakistan, which officially opposes the use of U.S. drones on its territory as an infringement on its sovereignty but is believed to have tacitly approved some...