(CBS/AP) WASHINGTON - A firsthand account of the Navy SEAL raid that killed Osama bin Laden differs, at least in part, from previous accounts by administration officials.
The author, who spoke to "60 Minutes" correspondent Scott Pelley in an interview scheduled to be broadcast Sept. 9, said that Bin Laden was apparently was hit in the head when he looked out of his bedroom door into the top-floor hallway of his compound as SEALs rushed up a narrow stairwell in his direction.
When the SEAL team entered the room, they found bin Laden down but still moving, at which two team members fired more bullets into the al Qaeda leader to ensure he was dead, unaware at that point whether he had any sort of explosive device on his body, CBS News senior correspondent John Miller said on "CBS This Morning."
In the account related by administration officials after the raid in Pakistan, the SEALs shot bin Laden only after he ducked back into the bedroom because they assumed he might be reaching for a weapon.
An AK-47 and two pistols were found in the room, though not in bin Laden's hands.
The book, "No Easy Day," was written under the pseudonym Mark Owen and is set to be published next week by Penguin Group (USA)'s Dutton imprint.
Other media outlets have reported on the SEAL's actual name, but CBS News does not identify members of classified counter-terrorism units.
White House spokesman Tommy Vietor would not comment on the apparent contradiction late Tuesday. But he said in an email, "As President Obama said on the night that justice was brought to Osama bin Laden, `We give thanks for the men who carried out this operation, for they exemplify the professionalism, patriotism and unparalleled courage of those who serve our country."'
"No Easy Day" was due out Sept. 11, but Dutton announced the book would be available a week early, Sept. 4, because of a surge of orders due to advance publicity that drove the book to the top of the Amazon.com and Barnes & Noble.com best-seller lists.
The account may again raise questions as to whether the raid was intended to capture or simply to kill bin Laden. Owen writes that during a pre-raid briefing, a lawyer from "either" the White House or Defense Department told them that they were not on an assassination mission. According to Owen, the lawyer said that if bin Laden was "naked with his hands up," they should not "engage" him. If bin Laden did not pose a threat, they should "detain him."
A former deputy judge advocate general for the Air Force said the shooting was understandable according to the orders the SEALS had.
"It wasn't unreasonable for the SEALs to shoot the individual who stuck his head out," said the former JAG, ret. Maj. Gen. Charlie Dunlap, who now teaches at Duke University law school.
"In a confined space like that where it is clear that there are hostiles, the SEALs need to take reasonable steps to ensure their safety and accomplish the mission," Dunlap said.
Dunlap adds that shooting bin Laden's fallen form was also reasonable in his legal opinion, to keep the terrorist from possibly blowing himself up or getting a weapon and shooting at the SEALs.
In another possibly uncomfortable revelation for U.S. officials who say bin Laden's body was treated with dignity before being given a full Muslim burial at sea, the author reveals that in the cramped helicopter flight out of the compound, one of the SEALs called "Walt" one of the pseudonyms the author used for his fellow SEALs was sitting on bin Laden's chest as the body lay at the author's feet in the middle of the cabin, for the short flight to a refueling stop inside Pakistan where a third helicopter was waiting.
This is common practice, as troops sometimes must sit on their own war dead in packed helicopters. Space was cramped because one of the helicopters had crashed in the initial assault, leaving little space for the roughly two dozen commandos in the two aircraft that remained. When the commandos reached the third aircraft, bin Laden's body was moved to it.
Owen writes disparagingly that none of the SEALs were fans of President Barack Obama and knew that his administration would take credit for ordering the May 2011 raid. One of the SEALs said after the mission that they had just gotten Obama re-elected by carrying out the raid.
But he says they respected him as commander-in-chief and for giving the operation the go-ahead.
Owen writes less flatteringly of meeting Vice President Joe Biden along with Obama at the headquarters of the 160th Special Operations Aviation Regiment after the raid. He says Biden told "lame jokes" no one understood, reminding him of "someone's drunken uncle at Christmas dinner."
Beyond such embarrassing observations, U.S. officials fear the book may include classified information, as it did not undergo the formal review required by the Pentagon for works published by former or current Defense Department employees.
Officials from the Pentagon and the CIA, which commanded the mission, are examining the manuscript for possible disclosure of classified information and could take legal action against the author.
In a statement provided to The Associated Press, the author says he did "not disclose confidential or sensitive information that would compromise national security in any way."
Jihadists on al Qaeda websites have posted purported photos of the author, calling for his murder.