The leader of an al Qaeda group has vowed to take revenge on the U.S. for the death of Osama bin Laden. Nasir al-Wahishi, leader of al Qaeda in the Arabian Peninsula (AQAP), said in a message posted on Islamist websites, “What is waiting for you is far greater and more dangerous, and you will then count your regrets, wishing for the days of Osama.” He also directly threatened any Arab leaders cooperating with the U.S., specifically the Yemeni and Saudi governments. Earlier this year, Michael Leiter, director of the National Counterterrorism Center said that AQAP was “the most significant risk to the U.S. homeland.” AQAP has claimed responsibility for the attempted “underwear” bombing of a plane on Christmas Day 2009, and the parcel bomb plot last November.