An outspoken supporter of President Trump from South Florida was charged on Friday with sending explosive packages to at least a dozen of the president’s critics, apparently bringing to a close an attempted bombing spree that has gripped the country just ahead of the midterm elections.

The suspect, Cesar Sayoc Jr., 56, was arrested outside a car-repair shop in the Miami area after a fast-moving investigation in which the authorities said they were able to pull a fingerprint from one of the bomb packages and collect Sayoc’s DNA from two others.

Sayoc, who seemed to be living out of a van in Aventura, Fla., was taken into custody on a day when four more explosive packages were found, including two intended for senators, both Democrats.

A federal criminal complaint spells out his contempt for this week’s many bomb targets, noting that Sayoc’s van was slathered with images and slogans often found on fringe right-wing social media accounts.

The complaint identifies a Twitter account that authorities said he used to rail against Democratic figures, and it notes that both his social media messages and the bomb packages used the same misspelling — “Hilary Clinton’’ — for Trump’s 2016 opponent.

Sayoc also posted frequently on right-wing social media groups, authorities said. On ­Facebook, Sayoc published photos of a Trump rally he attended during the 2016 presidential campaign. He was wearing a red “Make America Great Again’’ hat.

In all, Sayoc is believed to have sent at least 14 bombs to 12 targets, all of whom are regularly disparaged by the right.

Inside the packages sent to three of the potential targets — Barack Obama, former CIA director John Brennan, and Representative Maxine Waters — were a picture of each person with red ‘‘X’’ marks on them, according to the criminal complaint, filed by federal prosecutors in the Southern District of New York.

FBI Director Christopher A. Wray said the devices contained potentially explosive material, adding: ‘‘These are not hoax devices.’’

Of the four bombs discovered Friday, one was addressed to Senator Cory Booker, Democrat of New Jersey; another was sent to James Clapper, a former director of national intelligence; and a third was intercepted before it reached Senator Kamala Harris, Democrat of California.

A fourth, found in a mail facility in California, was addressed to Tom Steyer, a prominent Democratic donor, Steyer said.

At a news conference in Washington, Attorney General Jeff Sessions announced that Sayoc had been charged with five federal crimes, including the interstate transportation of an explosive, the illegal mailing of explosives, and making a threat against a former president and others.

Wray said that the bureau was still trying to determine if Sayoc’s bombs were “functional’’ but noted that they contained “energetic material’’ that could be dangerous. Wray said the investigation was “active’’ and cautioned there could be more bombs still undiscovered.

Speaking at the White House earlier Friday, Trump praised law enforcement for quickly arresting a suspect.

“These terrorizing acts are despicable and have no place in our country,’’ he said.

But in a morning Twitter post before the arrest was announced, the president characterized the attempted bombings as an obstacle blocking Republican voters ahead of the midterms. He suggested that the problem was not real, or exaggerated, putting the word “bomb’’ in quotes.

At a political rally in North Carolina on Friday night, Trump accused the media of using the pipe bomb incidents to ‘‘score political points’’ against him and the GOP.

The pro-Trump crowd broke into boos when he denounced negative media coverage and there were loud chants of ‘‘CNN sucks.’’ He said the media has a role to play in making the tone of political discourse less divisive.

In a phone interview with the Globe on Friday night, a Massachusetts native said Sayoc, the suspect, worked as a delivery driver at New River Pizza & Fresh Kitchen in Fort Lauderdale for more than a year before quitting in January.

Debra Gureghian, a 59-year-old who grew up on Cape Cod, attended Barnstable High School, and lived in Watertown before she moved to Florida to care for her ailing mother six years ago, said Sayoc would spew “anti-gay, anti-black, anti-Jewish’’ rhetoric “every day.’’

Gureghian said he told her that because she is a lesbian she is “deformed’’ and that she should be “put on an island with all the other gay people and burned.’’

“He spewed such garbage, it was so vile,’’ said Gureghian, who works as the restaurant’s general manager. “There’s so much hatred today.’’

Sayoc is a registered Republican whose arrest record in Florida dates back to 1991 and includes felony theft, drug, and fraud charges, as well as allegations that he threatened to use a bomb, public records show.

According to a police report, Sayoc called Florida Power and Light, a power company, in August 2002 and threatened to blow them up.

‘‘It would be worse than September 11th,’’ Sayoc said, according to the police report, which also said Sayoc threatened the company’s representative with physical harm if his electricity was turned off.

His criminal history from the Florida Department of Law Enforcement indicates that he listed his occupation some years ago as “manager.’’

According to a 2012 bankruptcy petition filed in Miami, Sayoc resided at the time at his mother’s home. “Lives w/mom,’’ a handwritten note on the petition said. “Has no furniture.’’

Sayoc was arrested around 11 a.m. Friday outside an AutoZone car repair shop in Plantation, Fla., about 20 miles from Aventura, officials said. The authorities also seized and towed away Sayoc’s white van, where he was apparently living.

Some residents of Aventura reported seeing a similar white van, the windows of which were plastered with a thick collage of pro-Trump stickers, often parked in the lot of a strip mall, the Aventura Waterways shopping center.

Photos of the van showed one of the stickers depicted a heroic Trump standing in front of flames and the American flag. Another was of Clinton’s face in the crosshairs of a rifle scope. A third said: “CNN Sucks.’’

Sayoc is expected to appear before a judge in Florida on Monday.

Danny McDonald of the Globe staff contributed. Material from the Washington Post and the Associated Press was used in this report.