The FBI also said it was responding to a report of a suspicious package at one of Schultz's offices in Florida.
A building housing CNN's NY bureau was also targeted in the incidents, which came just days after an explosive device was found in the mailbox at the NY home of USA billionaire and liberal donor George Soros, a target of right-wing groups.
"We also have to elect candidates who will try to do the same".
The packages will be transported to the FBI Laboratory in Quantico, Virginia for analysis, but the bureau is calling on the public to share any information they may have.
A bomb was posted to the NY house of ex-president Bill Clinton and his wife Hillary, while a "potential explosive device" was also headed to Barack Obama's home in Washington.
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He said the building has been evacuated, and the bomb squad is en route. The Secret Service found that package Tuesday night. I am appreciative of the law enforcement entities who intercepted the package and are investigating this matter.
Neither the Clintons nor the Obamas received the packages, and none had been at risk of receiving them because of screening procedures, the Secret Service said. The package was not delivered to Holder, but reached Wasserman Schultz's office as a "return to sender". "And it's a time of deep divisions, and we have to do everything we can to bring our country together", Clinton said. A suspicious package sent to New York Gov. Andrew Cuomo, D, was in fact a thumb drive, according to the NYPD.
Overhead TV shots showed that device, which law enforcement officials said was linked to the other explosives, being driven away.
Nobody has claimed responsibility for the bomb at this time.
"I think it would be naive to rule out that kind of possibility", he said, recalling how the arson attack on Germany's Reichstag building in 1933 eventually led to the "accelerated consolidation of power by the Nazis". But it is a troubling time isn't it?
Clinton and Obama representatives were not immediately available for comment.