Federal authorities have arrested a man in Florida, just outside of Miami, in connection to the suspected explosive packages discovered this week.
Johnson believes it's "highly likely" the person who built the bombs will have been previously flagged by law enforcement.
A law enforcement source tells the Miami Herald the arrest was made at an AutoZone in Plantation at 801 S. State Road 7 instead of his home to avoid any potential risky confrontation. If convicted, Sayoc could be sentenced up to 48 years in prison, officials said.
The packages addressed to Biden were intercepted at DE mail facilities in New Castle and Wilmington, according to a law enforcement official who, like others, wasn't authorized to discuss the investigation and spoke on condition of anonymity. They were addressed to leading Democrats, media organizations and prominent critics of the president.
A law enforcement source told Fox News that the suspect is a white male in his 50s, a former New Yorker, who lives in Aventura, Florida, who had prior arrests for terroristic threats. By the following morning, he'd abandoned that toned-down rhetoric and blamed the media for the discord in US public life. "I'm committed to doing everything in my power as President to stop it". "As the situation unfolded mid-morning - before the arrest was announced - the President complained on Twitter that the news media was busy reporting on "'Bomb' stuff" and not politics.
Trump tweeted a baseless conspiracy theory on Friday suggesting that the bombs were a plot to thwart GOP momentum in the midterms.
The head of the Federal Bureau of Investigation says the suspect arrested in the mail bombs sent to prominent Democrats was found in part using fingerprint evidence and possible DNA.
A law enforcement source said the devices appeared to be linked to the others sent to Democratic figures and CNN's New York City hub. Dade County court records showed Sayoc served a year's probation after a judge signed a discharge certificate in November 2002. In 2014, he was arrested after stealing copper pipes at a Home Depot, to which he plead guilty.
Sayoc appears to have a Facebook profile under the name Cesar Altieri Randazzo, featuring videos and photos of him attending multiple rallies for Trump, including at least one rally in Florida.
Sayoc also was arrested in North Carolina in 1999 on a stolen vehicle charge, which was later dismissed. MSNBC reported that he was registered as a Republican Party member.
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The other targets were ex vice president Joe Biden, Hollywood star Robert De Niro, billionaire donor George Soros, former CIA director John Brennan, former intelligence chief James Clapper, former attorney general Eric Holder, Congresswoman Maxine Waters, and Senators Cory Booker and Kamala Harris.
The new packages discovered on Thursday set off a new wave of alarm.
"We are treating them as live devices", NYPD Commissioner James P. O'Neill said at a news briefing, urging people not to touch packages they deem suspicious. On Friday, postal officials intercepted the package for Clapper, a CNN contributor, before it could reach the CNN offices, where it was addressed, according to the network.
CNN Worldwide President Jeff Zucker, whose network Trump has repeatedly attacked as "fake news", laid the blame at Trump's feet after the delivery of a suspected bomb prompted the evacuation of CNN's NY headquarters.
The package arrived in a manila envelope with six United States flag stamps, similar to other packages discovered this week. His ended up at the Florida office of Democratic Rep. They all also had a half-dozen Forever stamps, computer-printed address labels and return addresses bearing the misspelled name of Wasserman Schultz, who chaired the Democratic National Committee during part of the 2016 presidential campaign.
Mr Clapper told the news channel, where he works as an analyst, that the incidents were "serious" and "definitely domestic terrorism".
He added that the packages will "not silence the Trump administration's critics".
The bombs seized Wednesday were about 6 inches (15 centimeters) long and packed with powder and broken glass, according to a law enforcement official who viewed X-ray images. The motive is unknown, but the recipients are all prominent targets of right-wing criticism and, in many cases, of Trump himself.
In a tweet following the news, Trump wrote, "I will be speaking at the Young Black Leadership Summit in 15 minutes where I will address the investigation into the bomb packages". But they were uncertain whether the devices were poorly designed or never meant to cause physical harm. As one expert told NPR, the apparently homemade devices look as though they might include hazardous materials but not as though they could explode.
Authorities have branded the parcel bombs an act of terrorism. But the components could still provide clues - like the clock and the tape used.