U.S. official confirmed to FOX News Wednesday that Al Qaeda operative and bomb expert Abu Ubaida al-Masri is dead. Al-Masri was one of the top 10 Al Qaeda leaders and was responsible for the organization’s external operations, meaning he plotted attacks outside the tribal areas of Pakistan. The unidentified official said it is believed that al-Masri died of natural causes, possibly hepatitis, in Pakistan, and are staying away from a report that he was killed in a January CIA predator strike. Al-Masri is tied to two major terrorist attack plots. The first being the 2005 London subway bombing, in which al-Masri is credited with recruiting, training and directing the homicide bombers. The second attack with which al-Masri is associated is the liquid explosives bomb plot to blow up transatlantic flights bound for the U.S. and Canada in the summer of 2006. U.S. officials say al-Masri has probably been dead for several months, with no explanation as to why news of his death was not released sooner.