In the wake of the leak of thousands of classified documents, the U.S. Army has expanded its criminal investigation into a soldier allegedly involved in the earlier leak of a combat video and thousands of military documents, according to the Pentagon.

The expanded investigation was confirmed by Col. David Lapan at the Pentagon.

According to a U.S. military official who asked not to be named because he was not authorized to talk about the investigation, the probe by the Army's Criminal Investigation Division into Pfc. Bradley E. Manning was expanded to look at potential accomplices and what military or U.S. government systems the information came from.

CNN was unable to reach Manning's attorney.

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