The mayor of New Jersey's capital city denied any wrongdoing after FBI agents searched his home.
Trenton Mayor Tony Mack emerged from the house Wednesday and told reporters "we have not violated the public trust in any way."
A spokeswoman for the U.S. Attorney's Office in New Jersey could not say what was under investigation, or whether the office was involved.
FBI agents carried out bags and boxes following a search of the home.
Mack's first term in office has been punctuated by accusations of reckless spending and nepotism.
Under an agreement reached last year, the Democrat can only hire department heads from a pool of applicants the state offers or he risks losing $6 million in state aid.
A citizens group last year failed to get enough signatures to force a recall election.
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