Law enforcement sources tell CBS News that FBI agents are at a U.S. Postal facility in Opa-locka, Florida, where some of the suspicious packages may have originated.
Investigators are scrutinizing camera footage at the self-mailing kiosk machines inside the facility in south Florida. They're also combing through surveillance video footage at the facility and nearby businesses and canvassing the area.
“A lot of arrows pointing to Florida,” an anonymous official told CBS News.
The packages have a return address of Florida U.S. Rep. Debbie Wasserman Shultz, who is the former chairwoman of the Democratic National Committee.
During a Thursday news conference, law enforcement officials declined to publicly comment on Florida as a potential target of their investigation. But, the Wall Street Journal has published a similar report -- suggesting investigators are honing in on the state.
Authorities are currently trying to figure out if the devices were actually intended to explode or just cause fear.
Two law enforcement officials told the Associated Press the devices weren't rigged like traditional package bombs that would explode when opened, and the packages didn't seem to have trip wires.
After several devices were found Wednesday, three more suspicious packages were recovered Thursday. Two were sent to former Vice President Joe Biden, and one was mailed to actor Robert De Niro.
Information from CBS News was used in this report.
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