WASHINGTON (10/24/08)--The Federal Bureau of Investigation (FBI), yesterday posted online photographs of one of more than 50 threatening letters mailed to financial institutions in 11 states. In addition to a threatening message, most of the letters also contain a powder substance, according to a statement from the FBI. Field and laboratory tests on the powder so far have been negative, said the agency. Financial institutions in New York, New Jersey, Washington, District of Columbia, Ohio, Illinois, Colorado, Oklahoma, Georgia, California and Texas have reported receiving the letters. The Federal Deposit Insurance Corp. and the Office of Thrift Supervision also received letters, according to the FBI. The U.S. Postal Inspection Service is offering a reward of up to $100,000 for information leading to the arrest and conviction of the person(s) who prepared and mailed the letters, which were mailed from Texas and postmarked at Amarillo. "Should your any part of your institution--corporate offices, branches--receive one of theses letters, please contact your local FBI office and ask for the WMD Coordinator," said the FBI. Use the resource link for more information.