CBS News reported that Sarah Isgur Flores, a Justice Department spokesperson, said that a news conference is scheduled at 2:30 p.m. Authorities covered the vehicle with a blue tarp and took it away on the back of a flatbed truck.
Law enforcement sources tell the Miami Herald a trail of DNA evidence on either the packages or the devices quickly led investigators to a suspect identified as Cesar Sayoc, a 56-year-old man from Aventura.
Before that, a total of 10 devices were sent to the following eight individuals, according to the Federal Bureau of Investigation.
On Friday, packages surfaced for Democratic U.S. Senator Cory Booker of New Jersey, former U.S. Director of National Intelligence James Clapper and Democratic U.S. Senator Kamala Harris of California.
Since Monday, crude homemade bombs have been addressed to Barack Obama, Hillary Clinton, the CNN television network, liberal billionaire donor George Soros and other figures loathed by Trump's supporters.
Clapper appeared on CNN shortly after news of the package addressed to him broke, saying he felt relief that no one was harmed by that device.
Meanwhile, a local police bomb squad and canine units joined federal investigators on Thursday to examine a sprawling USA mail distribution center at Opa-Locka, northwest of Miami, Miami-Dade County police said.
The new packages discovered Thursday set off a new wave of alarm. Electrical wires leading out of the pipe led to an electric timer taped to the pipe, according to law enforcement officials speaking on condition of anonymity to discuss the investigation.More news: Saudi Arabia says Turkish evidence shows planned killing
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Regardless, investigators were treating the devices as "live" explosives New York City Police Commissioner James O'Neill said.
Trump said on Friday that news coverage of the suspicious packages had slowed momentum for Republican candidates before the congressional elections.
De Niro is calling on people to vote in light of the series of bombs addressed to targets of right-wing anger. "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.
The packages stoked nationwide tensions and fears as voters prepared to vote November 6 to determine partisan control of Congress - a campaign both major political parties have described in near-apocalyptic terms. He has called on people to vote at the midterm elections too. But he said, "Let this be a lesson to anyone regardless of their political beliefs that we will bring the full force of law against anyone who attempts to use threats, intimidation and outright violence to further an agenda".
Details suggested a pattern - that the items were packaged in manila envelopes, addressed to prominent Trump critics and carried US postage stamps.
The former Miami police investigator said it was impressive, but not shocking, that federal agents made an arrest in the package bomb case so quickly. The devices were being examined by technicians at the FBI's forensic lab in Quantico, Virginia. He also thanked "the courageous and resourceful security and law enforcement people for protecting us".
Wray said each of the 13 IEDs consisted of about 6 inches of PVC pipe, a small clock, a battery, wiring and energetic material.
The devices were packaged in manila envelopes and carried USA postage stamps.
The mail-bomb scare widens as law enforcement officials seized 3 more suspicious packages.
The first bomb discovered was delivered Monday to the suburban NY compound of Soros, a major contributor to Democratic causes.