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Update: Dallas Fire-Rescue has confirmed that the white powder found in an envelope is chalk.

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DALLAS (CBSDFW.COM) – Hazmat teams have responded to the Earle Cabell Federal Building in downtown Dallas after someone found a suspicious envelope containing white powder.

The envelope was found on the 14th floor, and touched by a couple people who have now been placed in isolation.

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The building has not been evacuated.

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