As federal authorities question a person of interest in the mailing of possibly poison-laced letters to New York Mayor Michael Bloomberg and President Obama, the FBI revealed late Thursday that they arrested a Washington man for allegedly sending his own group of suspicious letters to five targets including the President, an Air Force base and to the CIA. According to an FBI statement, the bureau arrested Matthew Buquet, 38, of Spokane last week after authorities intercepted a letter to a Spokane federal judge that later tested positive for the ricin toxin. He was charged with a single count for allegedly mailing threatening communications, but the FBI said four other "similar" letters were sent around the same time to a Spokane post office, the White House, a Washington Air Force base and to the CIA.