According to a report in USA Today, a federal grand jury in New Hampshire is weighing potential income tax evasion charges against the pair.

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Regulatory measures are also weighing on profits in the sector, including cuts in roaming charges and mobile termination fees, which national operators charge one another to use their networks.

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Sources close to the investigation say senior officials are weighing proposed grand jury indictments against as few as two to as many as six guards on criminal charges to be determined.

CNN: Feds near decision on indictments in Blackwater case