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More than 1.1 billion new $100 bills have been put into quarantine while officials search for a solution to a printing problem that has rendered some of the bills unusable, an official familiar with the situation said Monday.

Originally scheduled for a February 2011 release date, the bills were the first run of a high-tech note designed to combat counterfeiting by including a 3-D security ribbon.

The Federal Reserve first acknowledged an issue with the bills in October, but did not specify the scope of the problem. Get the full story »