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Update: Cornyn's Dallas-Area Office Gets Suspicious Letter

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Officials tested the suspicious package and it test results came back negative.

FARMERS BRANCH, Texas (AP) - A spokesman for U.S. Sen. John Cornyn of Texas says authorities are investigating a suspicious letter sent to a district office.

Cornyn spokesman Drew Brandewie says authorities have been called to his office in Farmers Branch, just north of Dallas. He declined to provide more information.

A message left for Farmers Branch police was not immediately returned.

Authorities are investigating a series of suspicious letters being sent to offices around the country, including two letters sent to President Obama and a Mississippi senator that have tested positive on a preliminary basis for poison.