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 Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE, was 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 Clinton Hillary Diane Rodham ClintonThe Memo: Trump furor stokes fears of unrest Bloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close MORE and former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins 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 Waters Maxine Moore WatersPowell, Mnuchin stress limits of current emergency lending programs Pelosi: House will stay in session until agreement is reached on coronavirus relief Omar invokes father's death from coronavirus in reaction to Woodward book MORE (D-Calif.).

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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 Schultz Deborah (Debbie) Wasserman SchultzFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Five things to watch at the Democratic National Convention Michelle Obama wishes Barack a happy birthday: 'My favorite guy' 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 Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies 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.