Detained Suspected Bomb Bomb in Florida. In the name of Cesar Sayak Jr., 56

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.

A law enforcement official identified the suspect as Cesar Sayoc Jr., 56, of Aventura, Fla., just north of Miami.

The arrest came even as the crude pipe bombs continued to appear across the country. Federal law enforcement officials said Friday that they had discovered three more of the explosive devices in three states.

One, found in Florida, was addressed to Senator Cory Booker, a New Jersey Democrat; another, discovered in a Manhattan post office, was sent to James R. Clapper Jr., a former director of national intelligence; and a third was intercepted before it reached Senator Kamala Harris, a California Democrat.