UPDATE: Authorities say they have arrested a Florida man "in his fifties." There will be a press conference at 2:30 pm EST. From the Miami Herald:
The Miami Herald has learned that the suspect who has been arrested is a man in his 50s from Aventura. He is being questioned by FBI agents with the joint terrorism task force since his arrest this morning at about 10 a.m.
A law enforcement source tells the Miami Herald the arrest was made at an auto parts store in Plantation, Florida. Miami Herald news partner CBS4 reports the arrest was made about 10:30 a.m. Friday morning, and a “loud explosion” was heard at the time of the arrest.
CNN reported Shimon Prokupecz tweeted that “multiple law enforcement sources” confirmed federal authorities arrested a Florida man.
A van reported to belong to the suspect is covered in right-wing and pro-Trump bumper stickers:
Breaking this morning:
More as story develops....
UPDATE: Another package was found in at a New York City package facility, addressed to former DNI chief James Clapper.