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Washington • U.S. officials say the number of Air Force service members implicated in a nuclear-force cheating scandal has roughly doubled from the 34 initially cited by the Air Force.

It wasn't immediately clear whether the additional 30-plus airmen implicated in an investigation into cheating on proficiency tests are alleged to have participated in the cheating directly or were involved in some indirect way.

The officials spoke on condition of anonymity because they were not authorized to disclose the information by name while the investigation is ongoing.

The Air Force announced on Jan. 15 that in the course of a criminal investigation into alleged drug use, it discovered that one missile officer at Malmstrom Air Force Base, Mont., had shared test questions with 16 other officers. It said another 17 admitted to knowing about this cheating but did not report it.