Calif. man arrested for anthrax letters

Authorities say none of the letters sent by 66-year-old Marc Keyser have tested positive for hazardous material.

Two Sacramento TV stations and a few other sites received letters on Wednesday.

As the FBI warns media outlets to be careful of their mail, The Star Tribune of Minneapolis is the latest news organization to receive a package containing a white powder labeled "anthrax."

Keyser is being held at the Sacramento County Jail and is expected to be in court on Thursday.

The Associated Press contributed to this story.

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