Osama bin Laden
A drawing, released by the United State Department of Defense May 2, 2011, shows the compound that Osama bin Laden was killed in Abbottabad, Pakistan Photo by Reuters
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Natasha Mozgovaya
President Barack Obama's top counter terrorism adviser John Brennan Photo by Natasha Mozgovaya

The United States has no choice but to kill al-Qaida leader Osama bin Laden during the raid on his hideout in Pakistan, President Barack Obama's top counter terrorism adviser said Monday.

"We certainly were preparing to the possibility to capture him. If we had an opportunity to take him alive we would have done it‬," John Brennan said. The minutes passed like days and the president was very concerned about the security of our personnel. It was very intense. And finally we were informed about the results there was a sigh of relief‬."

Bin Laden was killed in a U.S. helicopter raid on a mansion compound near the Pakistani capital Islamabad, ending a long worldwide hunt for the mastermind of the Sept. 11, 2001, attacks on the United States.

Brennan also said that the White House believes the woman killed when U.S. forces shot dead bin Laden was one of his wives. Brennan told reporters her body was positioned in a way that "she was being used as a shield." But he said it was not clear if she had placed herself in the line of fire, or had been held there as a shield by bin Laden or his son.

U.S. national security officials said earlier Monday that special forces set out to kill Osama bin Laden and dump his body in the sea to make it harder for the al Qaeda founder to become a martyr.

"This was a kill operation," one of the officials said.

"If he had waved a white flag of surrender, he would have been taken alive," the official added. But the operating assumption among the U.S. raiders was that bin Laden would put up a fight -- which he did.

Bin Laden "participated" in a firefight between the U.S. commandos and residents of the fortified mansion near the Pakistani capital Islamabad where he had been hiding, the official said.

The official would not explicitly say whether bin Laden fired on the Americans, but confirmed that during the course of the 40-minute operation the U.S. team shot bin Laden in the head.

In addition to the woman who U.S. officials believe was used as a human shield, three other men lay dead after the raid, but no Americans were killed.

A senior Obama administration official said the commandos knew that bin Laden probably would be killed rather than captured.

"U.S. forces are never in a position to kill if there is a way to accept surrender consistent with the ROE (rules of engagement). That said, I think there was broad recognition that it was likely to end in a kill," the administration official said.

The operation was carried out by a team of about 15 special forces operatives -- most, if not all, U.S. Navy Seals, according to U.S. officials familiar with the details. They indicated the team was based in Afghanistan.

One official said it included forensic specialists whose job was to collect evidence proving that bin Laden was caught in the raid and intelligence that might be useful in tracking down other al Qaeda leaders or foiling ongoing plots.

Within hours of bin Laden's death, which Obama announced in a dramatic, late-night White House speech, the commandos had buried bin Laden's body at sea, two U.S. officials said.

It was done so that bin Laden's dead body would not become a symbol of veneration or inspiration for would-be militants, U.S. officials said.

"You wouldn't want to leave him so that his body could become a shrine," one of the officials said.

U.S. officials said the key information that eventually led to bin Laden's trail came from questioning of militants detained by U.S. forces following the Sept 11, 2001 attacks on New York and Washington.

Captured militants, including some held at the U.S. military prison at Guantanamo Bay in Cuba, told intelligence officials of a particular al-Qaida "courier" whom they had heard was close to bin Laden.

They also mentioned two captured al Qaeda operations chiefs, including Khalid Sheikh Mohammed, widely believed to have masterminded the attacks.

Initially U.S. intelligence did not know either the name or whereabouts of the courier. But officials said that about four years ago, U.S. agencies learned the individual's name.

Two years ago, U.S. intelligence received credible information indicating that the courier and his brother, another suspected militant operative, were operating somewhere near Islamabad.

Then, last August, the U.S. pinpointed the compound in Abbotabad where intelligence indicated the two brothers, their families, and a third large family were living.

It was located in a ritzy neighborhood at the end of a dirt road, not far from one of Pakistan's principal military academy. Other residents of the area included retired Pakistani military officers.

Working with the National Geospatial-Intelligence Agency (NGA), which analyzes pictures from spy satellites and aircraft, and the National Security Agency, which conducts electronic eavesdropping, the CIA concluded that the compound was built with unusual security features -- including high-walls topped with barbed-wire -- and that its inhabitants appeared to take unusual security precautions.

By earlier this year, the CIA believed that it had "high confidence" that a "high-value" al-Qaida target was at the
Abbotabad compound and a strong probability that this target was bin Laden.

But one official said the agency was never "100 percent certain" that bin Laden was the one who was hiding out.