A DOJ press conference providing details is scheduled for 2:30 p.m. Friday.
Shortly before the person was detained Friday Attorney General Jeff Sessions said Friday law enforcers are "working tirelessly" to resolve the issue and vowed to "find the person or persons responsible and bring them to justice".
Federal authorities have arrested one individual in connection with suspected explosives sent to top Democrats, former senior USA officials and prominent critics of President Donald Trump, the Department of Justice said on Friday.
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".
According to Miami-Dade County jail booking records, Sayoc called Florida Power and Light and threatened to blow up the local electric utility.
The FBI has reportedly been searching a mail facility in Florida for clues about the packages. Clapper's package was intercepted at a New York City mail facility, although it was sent to CNN where he is an analyst.
The one that was delivered to CNN's NY office was delivered by a courier, one of the law enforcement officials said.
A van in Plantation was towed away to Miramar, Florida, where an Federal Bureau of Investigation field office is located, a law enforcement official said.
"Whoever is doing this is just trying to elicit a fear or disrupt something", said Ryan Morris, founder of Tripwire Operations Group, a company that provides explosives training to law enforcement and military officials.
The 11th package was addressed to Booker, a Democratic senator from New Jersey, and was discovered at a mail sorting facility in Florida, the Federal Bureau of Investigation said.
Two weeks ago, Sayoc threatened a former Democratic congressional spokeswoman on Twitter after her appearance on Fox News.
The explosive devices were packed in envelopes with bubble-wrap interiors bearing six American flag stamps and the return address of Florida Rep. Current and former investigators have said this suggested she was a possible target of the attacks.
The packages stoked nationwide tensions ahead of the November 6 election to determine control of Congress - a campaign both major political parties have described in near-apocalyptic terms.
None of the devices exploded and no one was injured.
In the 2002 bomb threat case, Sayoc pleaded guilty to the felony without a trial and was sentenced to probation, the records show.
Investigators believe the mailings were staggered.
Authorities appealed to the public for tips at a Thursday afternoon news conference in NY. Trump and his allies in conservative media spread disinformation, gaslighting his supporters into a state of such hatred and delusion that we now have a radicalized terrorist who attempted to act on that hatred. "No piece of information is too small, every tip could be the one that leads to something important", Wray said. "We will prosecute you", he said. "This is something that should be taken seriously".
The bombs are about 6 inches (15 centimeters) long and packed with powder and broken glass, according to a law enforcement official who viewed X-ray images.
In linking him to the Twitter account, The Associated Press noted that it contains imagery that mirrored what appeared on the side of the van that authorities seized. Most of the devices appeared to have been sent through the mail system.
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