F.B.I. agents seized Mayor Eric Adams’s electronic devices early this week in what appeared to be a dramatic escalation of a criminal inquiry into whether his 2021 campaign conspired with the Turkish government and others to funnel money into its coffers.
The agents approached the mayor after an event in Manhattan on Monday evening and asked his security detail to step away, a person with knowledge of the matter said. They climbed into his S.U.V. with him and, pursuant to a court-authorized warrant, took his devices, the person said.
The devices — at least two cellphones and an iPad — were returned to the mayor within a matter of days, according to that person and another person familiar with the situation. Law enforcement investigators with a search warrant can make copies of the data on devices after they seize them.
A lawyer for Mr. Adams and his campaign said in a statement that the mayor was cooperating with federal authorities, and had already “proactively reported” at least one instance of improper behavior.
“After learning of the federal investigation, it was discovered that an individual had recently acted improperly,” said the lawyer, Boyd Johnson. “In the spirit of transparency and cooperation, this behavior was immediately and proactively reported to investigators.”
Mr. Johnson said that Mr. Adams has not been accused of wrongdoing and had “immediately complied with the F.B.I.’s request and provided them with electronic devices.” Mr. Adams had attended an anniversary celebration for an education initiative at New York University.
The statement did not identify the individual, detail the conduct reported to authorities or make clear whether the reported misconduct was related to the seizure of the mayor’s devices. It was also not immediately clear whether the agents referred to the fund-raising investigation when they took the mayor’s devices.
Mr. Adams, in his own statement, said that “as a former member of law enforcement, I expect all members of my staff to follow the law and fully cooperate with any sort of investigation — and I will continue to do exactly that.” He added that he had “nothing to hide.”
The surprise seizure of Mr. Adams’s devices was an extraordinary development and appeared to be the first direct instance of the campaign contribution investigation touching the mayor. Mr. Adams, a retired police captain, said on Wednesday that he is so strident in urging his staff to “follow the law” that he can be almost “annoying.” He laughed at the notion that he had any potential criminal exposure.
Spokesmen for the F.B.I. and the U.S. attorney’s office for the Southern District of New York, whose prosecutors are also investigating the matter, declined to comment.


