The FBI says five packages containing explosives targeting Hillary Clinton, former President Barack Obama, CNN and others are being analyzed at the bureau's lab in Virginia.
The agency says each package had a return address of "DEBBIE WASSERMAN SHULTZ," a misspelling of the Florida congresswoman's name.
The FBI confirmed all of the packages had printed address labels and six stamps.
The first of the packages was found Monday at the suburban New York compound of liberal billionaire George Soros.
The package delivered to CNN on Wednesday was addressed to former CIA Director John Brennan.
Another package was addressed to former Attorney General Eric Holder. The FBI says that package did not reach its intended destination and was rerouted to the return address on the envelope in Florida.
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