At least 13 improvised explosive devices, or IEDs, were sent to various individuals across the country, officials said.
He nearly certainly had no idea that lab technicians had linked DNA on two pipe bomb packages he was accused of sending to prominent Democrats to a sample previously collected by Florida state authorities.
Cesar Sayoc, of Aventura, Florida, faces five federal charges in connection with the mail bomb plot that spurred a weeklong, coast-to-coast investigation and spread fear of election-season violence with little precedent in the U.S. In one case, court records showed he was accused of threatening to use a bomb, though details were not immediately available.
During a briefing Friday in NY, federal authorities identified the man in custody as Cesar Altieri Sayoc, 56, of Aventura, Florida, a city about 20 miles north of Miami.
Later on Friday, federal authorities executed a search warrant at a residence associated with Sayoc, but he had been living in his van.
Sayoc's white van was plastered with Trump's image and political stickers.
CNN's New York City office was evacuated on Wednesday after a package containing a pipe bomb was found in the mailroom.
Earlier Friday, authorities swarmed a location in Florida and were quick to cover a white van covered in decals.
His social media accounts are littered with anti-Democrat sentiments and far-right memes.
Twitter and Facebook have now suspended these accounts. Over the past week, suspicious packages were sent to CNN, billionaire George Soros, former spymasters John Brennan and James Clapper, and a number of other prominent people. "He wasn't doing his job, I'll tell you that", the suspect's longtime friend and fellow DJ Scott Meigs admitted. "He wasn't paying attention". Furthermore, he said he would not be contacting Obama about his receipt of a package this week.
Earlier in the day, Trump addressed the matter in a tweet, complaining about the potential effect the pipe bombs could have on the midterms. Several posts contained anti-Muslim statements.
High Point University, which he listed on his LinkedIn CV, told the BBC that he was never enrolled there as a student. The school's registrar's office confirmed that Sayoc had applied, but said he was not now enrolled. At the time, the school only offered a two-year general education associate's degree.
Friday afternoon, authorities said more devices may still be in transit, and they need people to remain vigilant and report any information to authorities.
Two weeks ago, Sayoc threatened a former Democratic congressional spokeswoman on Twitter after her appearance on Fox News. "You can't make a political issue out of insane people", Benfield said.
Federal agencies from the Secret Service to the US Postal Inspection Service worked closely with local and state law enforcement, including the NYPD-FBI Joint Terrorism Task Force, both to safeguard the public and conduct a swift but methodical investigation across New York, Delaware, Maryland, Washington, D.C., Florida, and California.