Anthrax hoax envelopes in Texas expected to continue

Field tests by the FBI have determined that the white powder packaged in envelopes to 21 addresses in North Texas was cornstarch.

Hazardous materials teams, however, were sent to five Catholic and Protestant churches, 13 businesses, two mosques and one residence to handle and analyze the material in each case. The investigation is also being carried out by local law enforcement and U.S. postal inspectors, according to the Star-Telegram.

Each envelope contained a note, but authorities are not disclosing more information.

"We are not commenting at this time on the content of the note," Special Agent Mark Whit from the FBI’s Dallas office, told the Star-Telegram.

FBI officials also said that they expect more letters containing white powder to arrive at area locations as mail is delivered during the week. Two such letters were delivered on August 10. They began arriving at locations in Arlington, Grand Prairie, Dallas, Garland and Irving Texas on August 5.

The Rev. Jay Matthews of St. Stephen’s Anglican Catholic Church received an envelope containing white powder on August 7.

There was a sheet of paper inside of the envelope, but Richardson would not say whether it contained a note. The envelope was the standard size of a letter and contained an unfamiliar return address. Both the return address and the mailing address were generated on a computer, according to the Dallas Morning News.

“It looked like standard business mail,” Matthews told the Dallas Morning News.

As in the other cases, the white powder turned out to be cornstarch.