To date, the letters, which were similar in nature, have all had Texas postmarks, the FBI said in a press release. Additionally, the white powders contained in each of these have all been field tested and none of them were harmful. Samples have been forwarded to local laboratories for further testing.
The FBI has advised the governors' offices to be on the lookout for additional letters containing suspicious powders. If office staffs encounter a suspicious package they should not handle it. Isolate it immediately and activate the office's emergency response plan and notify a supervisor. Don't open, smell or taste it, the FBI warned. More information on what to do can be found here.
This investigation is being conducted by the FBI and United States Postal Inspection Service (USPIS). There is no confirmed connection between the incidents.
Anyone with information on who may be sending these letters is requested to contact the FBI, USPIS or local law enforcement.
