A single fingerprint and several misspelled words were among some of the clues that pointed the FBI to a Florida man who was charged Friday with mailing homemade bombs to prominent Democrats, The Washington Post reported.

Cesar Sayoc Jr., a supporter of President TrumpDonald John TrumpHouse Dems demand Barr cancel 'inappropriate' press conference on Mueller report DOJ plans to release 'lightly redacted' version of Mueller report Thursday: WaPo Nadler accuses Barr of 'unprecedented steps' to 'spin' Mueller report MOREwas arrested Friday in connection with a series of 13 suspicious packages and pipe bombs that were sent to high-profile Democrats including former President Obama, former Secretary of State Hillary ClintonHillary Diane Rodham ClintonMcAuliffe says he won't run for president in 2020 Chuck Todd slams reports that DOJ briefed Trump on Mueller findings: 'This is actual collusion' Crowdfund campaign to aid historically black churches hit by fires raises over M MORE and former Vice President Joe BidenJoseph (Joe) Robinette BidenMcAuliffe says he won't run for president in 2020 Ex-Obama campaign manager: Sanders can't beat Trump Trump says he'd like to run against Buttigieg MORE, among others.

FBI Director Christopher Wray said at a press conference following Sayoc's arrest that investigators were able to find a fingerprint on the envelope of a bomb sent to Rep. Maxine WatersMaxine Moore WatersHouse Dems demand Barr cancel 'inappropriate' press conference on Mueller report On The Money — Presented by Job Creators Network — Treasury misses Dem deadline on Trump tax returns | Senate GOP opposition to Cain grows | Dems challenge bank CEOs on post-crisis reforms Ocasio-Cortez grills bankers on if more should have gone to jail for financial crisis MORE (D-Calif.).

ADVERTISEMENT

The fingerprint marked a breakthrough for investigators, who were able to gather Sayoc’s cellphone records and track his surveillance in Florida, an official told The Post.

A number of posts supporting Trump and others critical of the media and Democrats also helped lead investigators to Sayoc.

Investigators were able to connect the more than one dozen packages because some contained the same misspellings, the Post reported. According to the criminal complaint against Sayoc, some of the packages included the same misspellings found on Sayoc's social media postings. 

Investigators pointed to the misspelling of Rep. Debbie Wasserman SchultzDeborah (Debbie) Wasserman SchultzWasserman Schultz: 'We need a President, not a comic book villain' Lawmakers join musical stars to celebrate Grammys on the Hill Dem lawmakers will attempt tour of detention facility they say turned them away MORE's (D), which was listed as the return address on some of the suspicious packages. The prominent Florida Democrat's name was spelled “Shultz” on the packages, according to the criminal complaint.

Suspicious packages were also sent to Wasserman Schultz, Sen. Kamala Harris (D-Calif.), Sen. Cory Booker (D-N.J.), Rep. Maxine Waters (D-Calif.), former Director of National Intelligence James ClapperJames Robert ClapperTen post-Mueller questions that could turn the tables on Russia collusion investigators Trump campaign falsely claims Barr revealed 'unlawful spying' in email to supporters Clapper: Barr's spying claim 'stunning and scary' MORE and former CIA Director John Brennan. Both packages addressed to Clapper and Brennan were addressed to them at CNN's New York offices. 

The 13 total packages contained improvised explosive devices that consisted of PVC piping, a small clock, wiring, a battery and "potential explosives,” Wray said during Friday's press conference.

Evidence technicians also found a DNA sample of two of the homemade explosive devices, which was a possible match to DNA obtained when Sayoc had previously been arrested.

Sayoc, a former pizza deliveryman and strip-club worker from Aventura, Fla., has a lengthy criminal record that includes a prior arrest in connection with threatening to use a bomb.

The 56-year-old was charged with interstate transportation of an explosive, illegal mailing of explosives, threats against former presidents and certain other persons, threatening interstate communication and assaulting federal officers. He could face up to 48 years in prison if convicted.