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suspicious package

Just a week after the 2001 al-Qaida attacks terrorized the U.S., anonymous letters with anthrax spores began arriving at congressional offices and media companies, killing five people, infecting 17 and unleashing their own wave of fear.

Updated at 6:30 p.m. ET

Federal authorities expanded their nationwide search on Thursday for the person who sent a wave of suspected explosive devices to political nemeses of President Trump.

Ten devices addressed to eight targets have been intercepted or discovered, but no one has been hurt. It isn't clear whether or not the attack is over; the FBI said it can't rule out that more suspicious packages might still be moving through the mail.