An arrest has been made in connection in the case involving suspicious packages being sent to critics of US President Donald Trump.
Cesar Sayoc, 56, was arrested in Miami, Florida, on Friday morning (local time). Local news stations showed investigators covering a white van covered in pro-Trump and anti-CNN stickers with a blue tarp near Fort Lauderdale. Some stickers showed Democratic party members, including Hillary Clinton, with crosshairs over their faces.
Sayoc faces up to 58 years in prison if found guilty, US Attorney General Jeff Sessions said.
"We will not tolerate such lawlessness, especially political violence."
Witnesses said an explosion could be heard shortly after 11am.
"I heard like a bomb," Dre, who declined to give his full name, told Reuters. "I opened the door and saw the FBI there."
The agents told him to stay inside.
- 12th suspicious package found in US
- Trump blames spate of package attacks on mainstream media
- Explosive devices sent to Obama, Clinton
Earlier, two more packages were intercepted, addressed to Democratic Senator Cory Booker and to former Director of National Intelligience James Clapper.
The two latest packages brought the total number to 12, with Barack Obama and Hillary Clinton among the list of targets.
The targets have all been critics, or perceived critics, of US President Donald Trump.
The arrest comes less than two weeks before the US mid-term elections.