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TUCSON - Rep. Raul Grijalva says white powder in an envelope delivered to his office is a toxic substance. Manuel Johnson with the FBI confirms to News 4 Tucson the powder needs to be tested in Phoenix before any determination can be made.

It has not been confirmed exactly what substance was mailed to Grijalva's offices, located at the 800 block of East 22nd Street.

A staff member called Tucson Police earlier today after finding an envelope containing the suspicious white powder. The offices were locked down by Tucson Police, and the FBI arrived to assist in the investigation.

Grijalva says his staff opened the envelope and found two pieces of paper with swastikas on them along with a baggy of white powder.

"It's really distressing. You know, I understand politics, I understand what's going on out there. But for people to feel that their way of expression is to hurt other people physically and endanger other people physically is a really sad commentary on how we're doing politics right now," Grijalva said.

Grijalva is a Democratic representative for Arizona's 7th congressional district.