03/26/2009 08:46 am ET Updated May 25, 2011

Threatening Letters Sent To Chase CEO

The U.S. Postal Inspection Service posted a $100,000 reward late Wednesday for information about a flurry of threatening letters sent to JP Morgan Chase facilities, its CEO Jamie Dimon, and several federal banking offices around the country this week.

"You need to be pay back. You will be killed in 10 days," one of the typewritten letters read, federal law enforcement officials told ABC News.

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