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DALLAS More envelopes containing a suspicious white powder have now been opened from coast-to-coast, and at least one was reportedly postmarked in North Texas.

One letter opened at a school in Maine had a Rowlett, Texas postmark, according to the Bangor Daily News.

It was one of seven envelopes to arrive at campuses across the country on Tuesday.

Schools in Plano, Maine, Massachusetts, New York, Rhode Island, and even as far away as Anchorage, Alaska got letters. Most were addressed to elementary schools.

On Monday, eight letters were discovered at schools in North Texas, an Alabama bank, a New York art gallery, a Connecticut school, and a Texas Instruments facility in Dallas.

So far, 15 envelopes in all have arrived in eight states.

In all cases, the powder was determined to be non-toxic. Several said the powder was corn starch.

These incidents resemble similar hoaxes mailed out over the last two years from Texas post offices.

Some close to one investigation wonder if the white powder letters are intended to test the emergency response system seeing who gets called out, and how fast they respond.

The person behind it and his or her motive remains a mystery.

Still, the FBI and the Postal Inspector are investigating the incidents as federal crimes.

E-mail: jwhitely@wfaa.com

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