Sayoc, 56, of Aventura, Florida, was arrested on Friday for allegedly mailing at least 13 explosive devices to leading Democratic figures, former high-ranking officials and others, FBI Director Christopher Wray said.
Friday night, Federal Bureau of Investigation agents questioned a person at a Broward County residence with a potential connection to Sayoc, but nothing came of the interview, according to law enforcement sources familiar with the probe.
Authorities were at that very moment linking DNA found on two bomb packages to a sample that was previously collected by the state of Florida and matching his fingerprints to one from a separate mailing that law enforcement officials said Sayoc sent.
The bombs were sent in manila envelopes lined with bubble wrap and consisted of plastic 6-inch pipes packed with explosive material and wired to small clocks and batteries, a criminal complaint filed in Manhattan federal court said. Among them: former President Barack Obama, former presidential nominee Hillary Clinton, actor Robert DeNiro and billionaire financier and political megadonor George Soros. A package arrived at CNN on Wednesday, directed to former CIA Director John Brennan.
"These are not hoax devices", Wray said of the bombs.
Almost all of the other targets who were intended recipients of packages also turn up in derogatory or highly critical tweets, including Hillary Clinton, Eric Holder and Maxine Waters.
Following the arrest, speaking at an event for young black conservatives, Mr Trump said "we must never allow political violence take root in America", saying the country "must unify". That was not uncommon for the amateur body builder and former stripper whose social media accounts are peppered with memes supporting Trump and posts vilifying Democrats. Kamala Harris of California said investigators were looking at a package sent to her office.
"I didn't know this guy was mad insane like this", said Stacy Saccal, manager of the Ultra Gentlemen's Club in West Palm Beach. "We don't talk politics or religion in a bar, you know?"
But Scott Meigs, another DJ at the club, had a different experience.
"Criminals make mistakes so the more opportunities that law enforcement has to detect them, the greater chance they're going to be able to act on that, and that appears to be what happened here", said former Justice Department prosecutor Aloke Chakravarty, who prosecuted the Boston Marathon bombing case. "But it was just his political views that scared me".
"I think that everybody on the Democratic side would look at that shooter of Congressman Scalise and absolutely condemn his action, him and anyone associated with him", Steyer said, referring to the shooting of House Majority Whip Steve Scalise, R-La., during a congressional baseball practice a year ago.