They spoke on condition of anonymity because they were not authorised to discuss the matter on the record.
According to the Florida Department of Law Enforcement, Sayoc's first arrest came in 1991, when he was arrested by the Broward Sheriff's Office and charged with grand theft, a third-degree felony. Court records show he filed for bankruptcy in 2012.
According to state corporate filings, Sayoc has two registered businesses that are active with the state, including Native American Catering and Vending and Ver Tech AG.
In 2004, the 56-year-old was arrested on multiple charges including fraud and drug possession.
Mr Sayoc's white van, which was seized by authorities, had numerous signs in the windows showing Mr Trump, including a drawing depicting the President standing on top of a tank emblazoned with "Trump" on the sides. Sayoc's social media accounts have also been uncovered, which include numerous posts threatening violence against Democrats, pro-Trump memes, and footage of Sayoc at a Trump rally. Authorities covered the vehicle with a blue tarp and took it away on the back of a flatbed truck. Cory Booker and former Director of National Intelligence James Clapper, the latest to be sent to prominent Democrats and critics of President Donald Trump that were discovered earlier this week. A total of 12 packages have been found so far. Kamala Harris; and another in NY addressed to James R. Clapper Jr., the Obama-era director of national intelligence. An earlier package had been sent to former Obama CIA Director John Brennan via CNN in NY.
None of the crudely manufactured devices detonated.
Several of the packages contained what officials called a "potential explosive device", though none were found to be operational.
"I never thought I'd be living among a terrorist", Sassin said.
Several of the packages went through a USA postal facility in Opa-locka, which is less than 10 miles from Aventura, where the suspect resides. A package addressed to Sen.
Most of those targeted were past or present US officials, but one was sent to actor Robert De Niro and billionaire George Soros. Debbie Wasserman Schultz Schultz (D-Fla.) also were sent packages, as were as liberal activist billionaire George Soros.
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Trump's supporters accused Democrats of unfairly suggesting the president was to blame for the bomb scare.
Clapper appeared on CNN shortly after news broke a package was addressed to him, saying he felt relief no one was harmed by that device. Clapper, a frequent Trump critic, told CNN that he was not surprised he was targeted and that he considered the actions "definitely domestic terrorism".
Asked if Sayoc was working alone, the FBI director said, "We do believe we caught the right guy", before adding that it was an active and ongoing investigation.
New York Police stand outside the Time Warner Center at Columbus Circle, Wednesday, Oct. 24, 2018 in New York.
A federal law enforcement source said charges would likely be brought by federal prosecutors in Manhattan and Sayoc transferred to New York City.
Wray added that "these are not hoax devices", though they are still being processed and analyzed by the Federal Bureau of Investigation in order to determine if "they were functional".
The devices were packaged in manila envelopes and carried US postage stamps.
FBI Assistant Director William Sweeney said thorough examinations of all the packages were under way at the FBI laboratory in Quantico, Virginia, near Washington DC.
The bombs have heightened tensions during what was already a highly contentious campaign season ahead of the November 6 elections in which Democrats are battling to seize control of Congress now held by Trump's Republican Party.
"A very big part of the Anger we see today in our society is caused by the purposely false and inaccurate reporting of the Mainstream Media that I refer to as Fake News", Trump said on Twitter.