Colombian President Gustavo Petro is under criminal investigation by at least two U.S. federal prosecutors’ offices, the New York Times reported on Friday, citing sources familiar with the matter.

The inquiries revolve around Petro’s possible meetings with drug traffickers and whether his presidential campaign solicited donations from traffickers, the sources told the New York Times.

The investigations are being carried out by the U.S. attorney’s offices in Manhattan and Brooklyn, according to the Times, which added that they remained in early stages.

Colombia’s presidency did not immediately respond to a request for comment.

Nicholas Biase, a spokesman for the U.S. Attorney’s office in Manhattan, declined to comment. A spokesman for the U.S. Attorney’s office in Brooklyn did not immediately respond to a request for comment.

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(Reporting by Kylie Madry in Mexico City, Luis Jaime Acosta in Bogota and Luc Cohen in New York; Editing by Daina Beth Solomon)