Meanwhile, President Trump congratulated and thanked law enforcement for its efforts. Sessions made the announcement on Friday in Washington. With this week's pipe bombs, that moment may have arrived. Wray added that investigators had matched fingerprints and genetic material on the bombs to Sayoc.
According to state voter registration records, Sayoc is a registered Republican who voted in the 2016 election.
Former intelligence chief James Clapper, one of the recipients of Friday's packages, told CNN: "This is definitely domestic terrorism, no question in my mind".
The development came as officials found and safely removed at least 13 pipe bombs at sites across the country.
All the people who were targeted are frequently maligned by right-wing critics, including former US President Barack Obama, former Secretary of State and presidential candidate Hillary Clinton and Obama's Attorney General Eric Holder.
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A thirteenth suspicious parcel was discovered addressed to Democratic U.S. Senator Kamala Harris of California, CNN reported. The package featured a Camden, New Jersey, address, reports NBC News, but may have ended up in Florida because of its return address - the other packages listed Rep.
Law enforcement officials told the AP that the devices, containing timers and batteries, were not rigged to explode upon opening. He said there was no imminent danger to the Time Warner Center, where CNN's NY office is located.
The first in the series of explosive devices was found Monday in a mailbox outside the NY home of billionaire philanthropist George Soros, a major donor to Democratic candidates.
A number of suspicious packages arrived in the mail today intended for former President Barack Obama, Democratic presidential nominee Hillary Clinton and the NY office of CNN. Debbie Wasserman Schultz, with her name misspelled.
Pressed by reporters Thursday on whether there could be a link between Trump's insults of political opponents and the bombs, White House Press Secretary Sarah Sanders replied, "the president is certainly not responsible for sending suspicious packages to someone no more than (Democratic Party Senator) Bernie Sanders was responsible for a supporter of his shooting up a baseball field practice past year". Both are major critics of Trump.
On Friday, an 11th package addressed to Cory Booker, a New Jersey senator often touted as a Democratic presidential hope, was intercepted in Florida, the Federal Bureau of Investigation confirmed.
A few more packages turned up on Thursday, addressed to former VP Joe Biden and to actor Robert De Niro's Manhattan restaurant.
In this case, those on internet message boards began to twist such disparate facts as photographs of what is believed to be suspect Cesar Sayoc's van, which was plastered with pro-Trump and anti-Democrat stickers, the spelling of his name, whose letters could be rearranged to spell another word that some posters claimed they thought was suspicious, and other more typical conspiracy theory-minded fare that is now a regular facet of those boards. Republicans had tremendous momentum, and then of course this happened, and it was all that people talked about, it was tragic, and rightfully so....