(Associated Press) The number of federal workers and retirees who owed delinquent income taxes jumped by nearly 12 percent in 2011, the Internal Revenue Service said Friday.

Nearly 312,000 federal workers and retirees owed more than $3.5 billion in back taxes as of Sept. 30, 2011, the agency said. The year before, about 279,000 workers and retirees owed $3.4 billion.

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