U.S. officials confirmed June 5 that senior al Qaeda leader Abu Yahya al-Libi was killed in an unmanned aerial vehicle (UAV) attack in northwest Pakistan the morning of June 4. The confirmation comes one day after U.S. and Pakistani officials announced that al-Libi had been the target of a UAV strike in Mir Ali, North Waziristan.

Second only to al Qaeda leader Ayman al-Zawahiri, al-Libi long served as a high-profile ideologue for the militant group. He was a militant preacher and frequently appeared in al Qaeda propaganda videos. Unlike many obscure, midlevel leaders who are killed in UAV strikes, al-Libi for years has been a well-known fixture in the leadership core. If reports of his death are true, his presence in Pakistan further shows that al Qaeda's senior leadership can find sanctuary in the South Asian country.

In addition, al-Libi's death would be the removal of yet another charismatic ideologue from the al Qaeda core's leadership, leaving only al-Zawahiri and Adam Gadahn as the established spokesmen for the group. Since the al Qaeda core primarily is an ideological organization, al-Libi's death would be a greater loss for the group than the Sept. 30, 2011, death of Anwar al-Awlaki, who was an ideological figure for al Qaeda in the Arabian Peninsula, primarily an operational organization.

Despite the U.S. statement, al-Libi's death should be considered dubious until al Qaeda corroborates it. The United States and Pakistan have issued erroneous death notices before — confirming a death is difficult in an area as isolated and hostile as North Waziristan. Indeed, al-Libi previously was reported dead following an airstrike in South Waziristan in December 2009. Sometimes death notices are released disingenuously to elicit a response from a group, which in turn can reveal its location, making it a target for authorities. We expect to see some sort of confirmation or dismissal of the U.S. confirmation from one of the remaining spokesmen over the next few weeks.