HOUSTON – The FBI believes the person who sent white powder to several Texas schools this month is also responsible for 380 letters mailed since 2008.
HISD's Condit, Barbara Bush and Crockett elementary schools and several in North Texas have received the letters in the last week.
All of them: were postmarked in North Texas; contained a threatening letter; and had a harmless white powder inside.
"All of the letters are believed to have come from the same person, who has taken steps to conceal his activities and prevent law enforcement from finding physical evidence of his crimes, including his fingerprints," the FBI said Wednesday.
FBI profilers have studied the letters and they believe the suspect is likely a male who "may not demonstrate a mastery of formal English."
He is probably over 30, considered odd or eccentric and may be unusually fascinated with the FBI, intelligence, terrorism, aerospace and conspiracy theories.
He may use unusual phrases and punctuation such as what is contained in a sample letter created by the FBI.
He may have a history of medical challenges and/or contact with the mental health care system.
Along with schools, the letters have been sent to day care centers, churches, government offices, U.S. Embassies abroad, restaurants, and other private businesses.
The FBI and the U.S. Postal Inspection Service announced a reward of up to $150,000 for information leading to the arrest and conviction of the culprit.
Anyone with information concerning these letters should contact the FBI at 1-800-CALL FBI (1-800-225-5324) or submit a tip online.