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The army allowed the service to take place because it was led by Maulvi Nazir, a militant commander who has focused his attacks on Afghanistan and is believed to have a peace deal with the Pakistani government, said the intelligence official and tribal chief.

But Mr. Wazir quoted Mr. Nazir as saying that militants would retaliate for bin Laden’s death with attacks in both Pakistan and the West.

Monday’s service took place in the main bazaar in Wana, the largest town in South Waziristan, the two officials. It was attended by at least 500 people, more than half of whom were militants. They shouted “Down with America, long live Osama” and also hurled insults at Pakistani leaders.

The details of the service could not be independently confirmed because most journalists are banned from traveling to the tribal areas.

The intelligence official spoke on condition of anonymity, in line with agency policies.

Islamabad has said it was wholly unaware of the impending U.S. attack on bin Laden’s compound, and U.S. officials have backed up that claim.

Pakistani Interior Minister Rehman Malik told Al-Arabiya TV on Monday that he learned about the U.S. raid “15 minutes after it had begun” but didn’t know that it was targeting bin Laden. He didn’t say how he knew about the operation.

Pakistani authorities insist they did not know bin Laden was in Abbottabad, and U.S. officials so far have said they see no evidence that anyone in the upper echelons of Pakistan‘s military and intelligence establishment was complicit in hiding the terrorist leader.

But in the days since, Pakistan has lashed out against the operation and warned the United States against any such unilateral strikes on its territory in the future.

On Monday, Pakistan‘s main opposition leader, former Prime Minister Nawaz Sharif, was the latest prominent figure to criticize the raid, calling it “an attack on our sovereignty.”

Associated Press writers Adam Goldman in Washington; Deb Riechmann and Nahal Toosi in Islamabad; and Ishtiaq Mahsud in Dera Ismail Khan, Pakistan, contributed to this report.