Story highlights Authorities have opened preliminary investigations

Weiner is alleged to have exchanged sexually explicit text messages with a purportedly underage girl

Washington (CNN) Prosecutors in the office of US Attorney Preet Bharara have issued a subpoena for Anthony Weiner's cell phone and other records, according to law enforcement officials.

The FBI and the New York Police Department have opened preliminary investigations of allegations that the former New York Democratic congressman exchanged sexually explicit text messages with a purportedly underage girl.

Spokespersons for the US Attorney's Office in Manhattan and the FBI declined to comment.

The allegations first surfaced in the Daily Mail

The online sexting relationship allegedly went on for months between Weiner and a girl claiming to be just 15. The Daily Mail reported she said he sent her numerous photos, one of him in a pool and at least one bare-chested.

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