A senior U.S. official has told Fox News that there are discussions "in progress" with Pakistani authorities to allow the U.S. to question Usama bin Laden's wives.
The officials are confident that they will be give a chance to interview his wives -- one of which told Pakistani interrogators that she had been staying in the Al Qaeda leader's hideout for five years, and could be a key source of information about how he avoided capture for so long, a Pakistani intelligence official said Friday.
In its first confirmation of bin Laden's death, Al Qaeda warned of retaliation in an Internet statement, saying Americans' "happiness will turn to sadness."
Bin Laden's wife, identified as Yemeni-born Amal Ahmed Abdullfattah, said she never left the upper floors of the house the entire time she was there.
She and bin Laden's other two wives are being interrogated in Pakistan after they were taken into custody following Monday's American raid on bin Laden's compound in the town of Abbottabad. Pakistani authorities are also holding eight or nine children who were found there after the U.S. commandos left.
Given shifting and incomplete accounts from U.S. officials about what happened during the raid, testimony from bin Laden's wives may be significant in unveiling details about the operation.
Their accounts could also help show how bin Laden spent his time and managed to stay hidden, living in a large house close to a military academy in a garrison town, a two-and-a-half hours' drive from the capital, Islamabad.
The Pakistani official said CIA officers had not been given access to the women in custody. Already tense military and intelligence relations between the United States and Pakistan have been further strained after the helicopter-borne raid, which many Pakistanis see as a violation of their country's sovereignty.
The proximity of bin Laden's hideout to the military garrison and the Pakistani capital has also raised suspicions in Washington that bin Laden may have been protected by Pakistani security forces while on the run.
Risking more tensions, missiles fired from a U.S. drone killed 15 people, including foreign militants, in North Waziristan, an Al Qaeda and Taliban hotspot close to Afghanistan, Pakistani officials said. Such attacks were routine last year, but their frequency has dropped this year amid opposition by the Pakistani security establishment.
Pakistan's army, a key U.S. ally in the Afghanistan war, on Thursday threatened to review cooperation with Washington if it stages anymore attacks like the one that killed bin Laden.
The Pakistani intelligence official did not say Friday whether the Yemeni wife has said that bin Laden was also living there since 2006. "We are still getting information from them," he said.
Another security official said the wife was shot in the leg during the operation and did not witness her husband being killed. He also said one of bin Laden's eldest daughters had said she witnessed the Americans killing her father.
Both officials spoke on condition of anonymity because they were not authorized to give their names to the media.
Meanwhile, Pakistan's intelligence agency has concluded that bin Laden was "cash strapped" in his final days, according to a briefing given by two senior military officials. Disputes over money between the terror leader and his No. 2, Ayman al-Zawahri, led Al Qaeda to split into two factions five or six years ago, with the larger faction controlled by al-Zawahri, they said.
The officers spoke to a small group of Pakistani reporters late Thursday. Their comments were confirmed for The Associated Press by the same security official who spoke about the shooting of bin Laden's wife and who was present at Thursday's briefing.
The officer didn't provide details or elaborate on how his agency made the conclusions about bin Laden's financial situation or the split with his deputy, al-Zawahri. The Al Qaeda chief apparently had lived without any guards at the Abbottabad compound or loyalists nearby to take up arms in his defense.
The image of Pakistan's intelligence agency has been battered at home and abroad in the wake of the raid that killed bin Laden. Portraying him as isolated and weak could be aimed at trying to create an impression that a failure to spot him was not so important.
Documents taken from the house by American commandos showed that bin Laden was planning to hit America, however, including a plan for derailing an American train on the upcoming 10th anniversary of the 9/11 attacks. The confiscated materials reveal the rail attack was planned as of February 2010.
Late Thursday, two Pakistani officials cited bin Laden's wives and children as saying he and his associates had not offered any "significant resistance" when the American commandos entered the compound, in part because the assailants had thrown "stun bombs" that disorientated them.
One official said Pakistani authorities found an AK-47 and a pistol in the house belonging to those inside, with evidence that one bullet had been fired from the rifle.
"That was the level of resistance" they put up, said the official, who also spoke on condition of anonymity.
His account is roughly consistent with the most recent one given by U.S. officials, who now say only one of the five people killed in the raid was armed and fired any shots, a striking departure from the intense and prolonged firefight described earlier by the White House and others in the administration.
U.S. officials say four men were killed alongside bin Laden, including one of his sons.
Reflecting the anger in Pakistan, hundreds of members of radical Islamic parties protested Friday in several Pakistan cities against the American raid and in favor of bin Laden. Many of the people chanted "Usama is alive" and blasted the U.S. for violating the country's sovereignty.
The largest rally took place in the town of Khuchlak in southwestern Baluchistan province, where about 500 people attended.
"America is celebrating Usama bin Laden's killing, but it will be a temporary celebration," said Abdullah Sittar Chishti, a member of the Jamiat Ulema Islam party who attended the rally in Khuchlak. "After the martyrdom of Usama, billions, trillions of Usamas will be born."
Fox News' Jennifer Griffin and the Associated Press contributed to this report.