At least 20 letters with a Texas postmark containing a white powdery substance have been sent to governors of 13 states since Monday, the FBI said late Thursday.
The latest flurry of letters is the second batch sent from the state.
In October, letters containing the substance were sent to 10 Chase banks in Colorado, three to Chase banks in Oklahoma, nine to Chase banks in New Jersey and to the Chase credit card center in Elgin, Ill.
Other financial institutions also received the letters.
The letters in October were mailed from Amarillo, Texas.
Robert E. Casey, special agent in charge of the Dallas FBI office, said Thursday governors in Rhode Island, Michigan, Mississippi, Alabama, Minnesota, Montana, Missouri, Maine, Oklahoma, Hawaii, Alaska, Texas and South Carolina have received the letters containing the substance.
All the letters sent to the governors were postmarked in Dallas in north-central Texas. Amarillo, where the letters plus threatening notes were sent to the Chase banks in the Denver area, is in the Texas panhandle.
Initial field tests on the substance sent to the governors have indicated it is not harmful.
The FBI has yet to find the sender of the letters sent to the Chase banks in Colorado.
FBI agent Mark White, spokesman for the FBI office in Dallas, said in October that in addition to the Chase banks, the Federal Deposit Insurance Corporation in Dallas and the U.S. Office of Thrift Supervision in nearby Irving, Texas, also received threatening letters that contained a white powder.
White said Thursday the substance sent to the governors has been forwarded to local laboratories for further testing.
White said anyone with information concerning the letters should contact their local FBI office or the Dallas FBI at 972-559-5000.
Howard Pankratz: 303-954-1939 or hpankratz@denverpost.com
