File photo of Anwar al-Awlaki, a U.S.-born cleric linked to al Qaeda's Yemen-based wing, giving a religious lecture in an unknown location

 
File photo of Anwar al-Awlaki, a U.S.-born cleric linked to al Qaeda
Anwar al-Awlaki, a U.S.-born cleric linked to al Qaeda's Yemen-based wing, gives a religious lecture in an unknown location in this still image taken from video released by Intelwire.com on September 30, 2011. Al-Awlaki personally directed and approved the attempted bombing of a U.S. airliner which a Nigerian man, Umar Farouk Abdulmutallab, tried to carry out on Christmas Day in 2009, according to new details released by federal prosecutors on February 10, 2012. Abdulmutallab, 25, is due to be sentenced on Thursday in Detroit and faces up to life in prison after pleading guilty to charges he tried to down a Northwest Airlines jumbo jet with 289 people aboard. REUTERS/Intelwire.com/Handout/Files (CIVIL UNREST POLITICS TRANSPORT) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. MANDATORY CREDIT