Crude pipe bombs addressed to prominent Democrats and others who have drawn ire from the right were found in mail sorting rooms across the country this week.
No one has been hurt since the first device was found on Oct. 22, but FBI officials said Friday the devices were not hoaxes.
A 56-year-old Florida man suspected of mailing the explosives, Cesar Sayoc, Jr., was taken into custody on Friday and faces five federal charges.
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13 Suspicious Package Incidents
Within five days, apparent explosive devices were detected in the mail addressed to Democratic politicians Barack Obama, Joe Biden, Hillary Clinton, Sen. Corey Booker and Rep. Maxine Waters; billionaire philanthropist George Soros; the New York City offices of CNN and others. No one was hurt and investigators are working to determine if the incidents are all linked, though many of the devices appeared similar.