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“Most of the allies are honest, some are not,” the spokesman said.

Pakistani Foreign Minister Makhdoom Shah Mehmood Qureshi, meanwhile, arrived in Kabul to meet with Afghan President Hamid Karzai. His discussions with Afghan and U.S. officials were expected to focus on how the three countries could work together to fight terrorism, improve economic ties and forge peace in Afghanistan.

Mr. Obama told the BBC in an interview broadcast Sunday that he could not allow “active plans to come to fruition without us taking some action” and would send troops again if a senior Taliban leader were found in Pakistan.

Pakistan is furious that that United States sent Navy SEALs to raid bin Laden’s Pakistan hideaway earlier this month without informing Pakistani authorities in advance.

But there are also parallel efforts to get the Taliban leadership into negotiations with the Afghan government, making it unclear if such a strike would be in the interest of the American or Afghan governments.

The Taliban has stepped up attacks as part of its yearly offensive against NATO, Afghan government installations and officials. Insurgents also have promised revenge attacks after the killing of bin Laden.

The Taliban claimed it was behind an attack Saturday on the main military hospital in Kabul that killed at least six Afghan medical students.

On Monday, however, NATO spokesman Brig. Gen. Josef Blotz told journalists that intelligence sources showed the Taliban-allied Haqqani network planned and carried out the suicide attack on the nation’s top medical facility.

Also Monday, a suicide bomber attacked a gathering of tribal leaders in eastern Laghman province, killing four tribal elders and wounding 14 others having lunch at a hotel, governor’s spokesman Faizanullah Patan said.

Associated Press writers Jon Gambrell in Kabul and Nahal Toosi in Islamabad, Pakistan, contributed to this report.