Washington ? Despite their fall from power, a half-dozen key Taliban leaders pose a threat to U.S. interests in Afghanistan and elsewhere and remain high on America’s target list.

Mullah Mohammed Omar, the Taliban supreme leader, heads the list. He vanished from Kandahar as U.S.-backed forces rolled in.

A top Omar aide, Tayeb Agha, is also wanted by U.S. forces.

Another key figure who has survived is Jalaluddin Haqqani, a former U.S. ally and the Taliban’s former minister of frontier affairs. Since the war in Afghanistan, he has been supporting efforts by al-Qaida and Taliban fighters intent on regrouping, U.S. officials say.

The officials believe Haqqani was working closely with al-Qaida field commander Abu Zubaydah, who was said to have been driving the terrorist network’s efforts to reconstitute itself from Pakistan, with an eye toward conducting new international terrorist attacks. Abu Zubaydah was captured March 28, but Haqqani was not found.

Officials also name three of Omar’s generals, all of whom commanded large bodies of troops, as top targets.

Mullah Baradar Akhund, Akhter Mohammed Osmani and Mullah Dadullah all are potential guerrilla commanders seen as threats to the U.S.-backed government of Hamid Karzai. Military officials are concerned that fighters in Afghanistan may renew their efforts with the spring thaw.

Several other Taliban leaders are in custody of the United States or its Afghan allies, including Mullah Fazel Mazloom, army chief of staff; Mullah Abdul Wakil Muttawakil, minister of foreign affairs, and Mullah Abdul Salam Zaeef, ambassador to Pakistan.

The Taliban’s intelligence chief, Qari Ahmadullah, was killed by U.S. bombing on Dec. 27.