A former member of the Navy SEALs who participated in the raid that killed Osama bin Laden is under criminal investigation for possibly revealing classified material, reports said.
Matt Bissonnette wrote a first-hand account called No Easy Day under the pseudonym Mark Owen.
He landed in hot water with the Pentagon, who said he disclosed classified information in violation of the nondisclosure agreements he had signed as a SEAL.
No Easy Day aims to recount the raid from the SEALs' point of view
He disputes the charge, though he apologised for not having the book vetted by the Pentagon.
Bin Laden was killed in a May 2011 raid in Abbottabad, Pakistan.
According to The New York Times, the investigation will look into whether classified information was disclosed in the book as well as in a series of speeches that Mr Bissonnette gave to corporate events.
The newspaper cited federal officials and Mr Bissonnette’s lawyer.
NBC, which also reported the probe, said negotiations are under way with the Defence Department over profits of the book.
Mr Bissonnette said at the time that he decided to produce the book because details of the raid that were being leaked by others in government were wrong.
US Navy SEALs, both active duty and retired, possess highly sensitive information about tactics and techniques that are central to the success of their secret and often dangerous missions overseas.
That is why they are obliged to sign non-disclosure agreements when they enter service and when they leave.
Separately, Fox News has announced that it will reveal the identity of the man who pulled the trigger on the terror mastermind in an interview to air next month.
The hunt for bin Laden was fictionalised in the 2012 movie Zero Dark Thirty.