New York Times

Federal authorities made an arrest on Friday in connection with the nationwide bombing campaign against outspoken critics of President Trump, a significant breakthrough in a case that has gripped the country in the days leading up to the midterm elections.

It was not immediately clear who had been taken into custody, but a man was arrested in Florida, three law-enforcement officials said. One of them said the man was in his 50s.

Washington Post

A law enforcement official said the person in custody was a man in his 50s. According to another person familiar with the investigation, this man lives in Florida near a facility which the packages were mailed through. It remains unclear if this man acted alone or had help, this person said.