1. Pipe bombs were sent to several prominent Democrats and to CNN’s New York offices, above, prompting an evacuation.

Investigators are looking for links and trying to determine whether a bomber is going after political figures vilified by the right wing.

New York’s mayor, Bill de Blasio, called the Manhattan episode “an act of terror.” Other devices were addressed to former President Barack Obama and former Secretary of State Hillary Clinton, among others. A similar bomb was found Monday at the New York home of George Soros, a major contributor to Democratic causes.