ABBOTTABAD, Pakistan (AP) -- The death of Osama bin Laden in a fortress-like compound on the outskirts of a Pakistani city that is home to three army regiments and thousands of soldiers raises questions over whether Pakistani security forces knew the whereabouts of the world's most wanted man.
The al-Qaida chief was living in a house in Abbottabad that a U.S. administration official said was "custom built to hide someone of significance." The city around 60 miles from the capital Islamabad is a far cry from the remote mountain caves along the Pakistan-Afghanistan tribal border where most intelligence assessments had put bin Laden in recent years.
Critics have long accused elements of Pakistan's security establishment of protecting bin Laden, though Islamabad has always denied this. Ties between the United States and Pakistan have hit a low point in recent months over the future of Afghanistan, and any hint of possible Pakistani collusion with bin Laden could hit them hard even amid the jubilation of getting American's No. 1 enemy.
That bin Laden could be in Abbottabad unknown to authorities "is a bit amazing" says Hamid Gul, a former Pakistani intelligence chief fiercely critical of America's presence in the region. Aside from the military "there is the local police, the Intelligence Bureau, Military Intelligence, the ISI, they all had a presence there."
Pakistani security forces blocked access to the compound Monday, but Associated Press reporters saw the wreckage of a helicopter that crashed during the operation. Local residents described the sounds of bullets, the clatter of chopper blades and two large explosions as the raid went down.
The compound was around one kilometer (half a mile) away from the Kakul Military Academy, an army-run institution for top officers and one of several military installations in the bustling, hill-ringed town of around 400,000 people.
An American administration official said the compound was built in 2005 at the end of a narrow dirt road with "extraordinary" security measures. He said it had 12 to 18-feet walls topped with barbed wire with two security gates and no telephone or Internet service connected to it.
A video aired by ABC News that purported to show the inside of bin Laden's compound included footage of disheveled bedrooms with floors stained with large pools of blood and littered with clothes and paper. It also showed a dirt road outside the compound with large white walls on one side and a green agricultural field on the other.
Pakistan's government and army are very sensitive to concerns that they are working under the orders of America and allowing U.S. forces to operate here. Some critics assailed Pakistan for allowing the operation, while at least one Islamist party staged a protest against the killing of a man idolized by militants inside of Pakistan.
"Down with America! Down with Obama!" shouted more than 100 members of a breakaway faction of the Jamiat Ulema Islam party in the southwestern city of Quetta. "Jihad, jihad the only treatment for America!"
The Pakistani Taliban, an al-Qaida allied group behind scores of bombings in Pakistan and the failed bombing in New York's Times Square, vowed revenge.
"Let me make it very clear that we will avenge the martyrdom of Osama bin Laden, and we will do it by carrying out attacks in Pakistan and America," Taliban spokesman Ahsanullah Ahsan told The Associated Press by phone. "We will teach them an exemplary lesson."
The U.S. closed its embassy in Islamabad and its consulates in the cities of Lahore, Karachi and Peshawar on Monday for fear of unrest.
Pakistan's former President Pervez Musharraf, who is eyeing a political comeback, said the "killing was the success of all peace loving people of the world." But he also said the Americans should not have been allowed to operate independently in the country.
One Pakistani official said the choppers took off from a Pakistani air base, suggesting some cooperation in the raid. President Barack Obama said Pakistan had provided some information leading to the raid, did not thank the country in his statement on bin Laden's death.
Pakistan's intelligence agency and the CIA have cooperated in joint raids before against al-Qaida suspects in Pakistan on several occasions since the Sept. 11, 2001 attacks. But U.S. and Pakistani officials indicated that this mission was too important to let anyone know more than a few minutes in advance.
Pakistan's foreign office hailed the death as a breakthrough in the international campaign against militancy, and noted al-Qaida "had declared war on Pakistan" and killed thousands of Pakistani civilians and security officers.
It stressed that the operation to kill bin Laden was an American one, and did not mention any concerns that Pakistani officials may have been protecting bin Laden in some way. Domestically, the already weak government may yet face criticism by political opponents and Islamists for allowing U.S.