The Manhattan U.S. attorney’s office is pursuing an investigation into possible money laundering by Paul Manafort, said three people familiar with the matter, adding to the federal and state probes concerning the former Trump campaign chairman.

The investigation by the U.S. attorney for the Southern District of New York is being conducted in collaboration with a probe by special counsel Robert Mueller into Mr. Manafort and possible money laundering, according to two of these people.

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