A man suspected of mailing more than a dozen threatening letters containing white powder to Rep. Nancy Pelosi (news, bio, voting record), Jon Stewart and other high-profile figures was in custody and awaiting a court appearance.
Prosecutors were expected to file a criminal complaint against Chad Conrad Castagana, 39, in U.S. District Court in Los Angeles on Monday. He was arrested Saturday for allegedly conveying false information and sending threats by U.S. mail.
Preliminary tests showed the white powder was not hazardous, officials said.
The letters, which had fake return addresses, were received by Pelosi, a California Democrat who is in line to become speaker of the House; comedians Stewart and David Letterman; Democratic Sen. Charles Schumer (news, bio, voting record) of New York; and MSNBC host Keith Olberman.
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