Documents released on Tuesday revealed that police investigating the mass shooting last October in Las Vegas were seeking to question a second man in connection to the attack.

The identity of the man has not been previously reported. It is unclear whether the man who was identified in the documents as a person of interest remains under investigation. The authorities have said that Stephen Paddock was the sole gunman responsible for the attack, but that there was one additional person of interest still under investigation whom they declined to identify.

On Tuesday, a Nevada court unsealed hundreds of pages of search warrants, including an affidavit filed less than a week after the shooting that identifies the gunman’s longtime girlfriend as a person of interest. The authorities subsequently said the girlfriend, Marilou Danley, was not considered a suspect and that she had continued to cooperate with local and federal investigators.

The records also included another person of interest, Douglas Haig, whose name the judge ordered redacted. The Las Vegas Review-Journal used an unredacted copy and identified Mr. Haig.