No one has claimed responsibility and the FBI urged the public to report any tips. The packages consisted of a manila envelope with a bubble-wrap interior containing "potentially destructive devices," the FBI said. Each bore a computer-printed address label and six "Forever" postage stamps, the agency said.
Some of the packages sent to New York locations had envelopes of white powder in them, but FBI Assistant Director William Sweeney said at a briefing in New York that initial analysis showed it was not a biological threat.
The pipe bombs discovered on Wednesday were similar to the ones sent to Biden and De Niro, a federal official told Reuters. Authorities described the devices as crude while security experts said their goal may have been to create fear rather than to kill.One of the bombs was sent to the New York headquarters of CNN, which Trump has frequently derided for its coverage of him, and the network said on Thursday the device was being taken in a bomb-proof truck to the FBI lab in Quantico, Virginia, for analysis.
Leading Democrats said the bombs were a dangerous outgrowth of an antagonistic political atmosphere created by the president.
Trump and other Republicans have likened Democrats to an "angry mob," citing protests at the confirmation hearing of U.S. Supreme Court Justice Brett Kavanaugh.
The FBI said on Thursday one of the two packages sent to Biden - who once said he would have fought Trump if they were in high school - was discovered at a mail facility in his home state of Delaware and the second at another location.
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