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TUCSON - Police have locked down Rep. Raul Grijalva's office after an envelope containing white powder was found there.

Adam Sarvana, a spokesperson with Grijalva's office, confirms that the envelope was mailed to the office, located in the 800 block of East 22nd Street.

Tucson Police confirm that a staff member contacted them at about 12:15 p.m. There are currently bomb technicians and other officers on the scene.

News 4 has a crew at the scene, and we will update this story as it develops.