Biden's package was similar to others containing bombs sent to prominent Democrats this week.
The FBI said one of the two packages sent to Mr Biden - who once said he would have fought Mr Trump if they were in high school - was discovered at a mail facility in his home state of de and the second at another location.
A wide swath of investigators from NY to California to D.C.to Florida are devoted to the case, which (miraculously) has not yet injured anyone, although as CNN's Jake Tapper noted on Twitter, the devices within these packages "were rudimentary but functional ..." There was no need to evacuate because the building was empty, police said.
The US Secret Service intercepted packages addressed to Obama at his Washington home and to Clinton, the 2016 Democratic nominee for president, at her home in NY state. Waters was targeted twice, and all the packages apparently had Rep.
Police have cautioned people to avoid the area and expect heavy police presence and traffic.
The politics belied the life-and-death nature of the growing list of bombing targets in New York, Delaware, Washington DC, Florida and California. The first level is to do a full investigation.
Federal authorities intercepted several more suspicious packages on Thursday morning, bringing the total to 10 suspicious packages found. "Second, especially in NY, you want to retain a sense of control, you want people to know that you're acting and you're acting appropriately and they're safe".
Law enforcement officials said that device in Soros' mailbox "had the components" of a bomb and contained explosive powder.
At the National Board of Review Annual Awards Gala, De Niro also went after Trump on stage, saying: 'Our baby-in-chief - the jackoff-in-chief, I call him - has put the press under siege, ridiculing it and trying to discredit it through outrageous attacks and lies.
The NYPD says the device was taken from 375 Greenwich Street in the Tribeca neighbourhood around 6:30am (local time).
"We're working with the postal service to see if we can predict if any more of these packages do show up", said New York City Police Commissioner James O'Neill.
On the campaign stump in Mosinee, Wis., Wednesday night, President Donald Trump appeared to tone down past rhetoric about Democrats and news media, in light of the attacks.
A third suspicious package was found in the mailroom of the Time Warner building in New York City, where CNN has offices. The devices were made from PVC pipe and covered with black tape. "All New Yorkers have a responsibility to pay attention to what's going on around them". "Let's get along", he said.
Similar packages addressed to Clinton and Obama were on their way to Chappaqua, New York, where Clinton lives with former President Bill Clinton and to Washington DC, where Obama lives with his wife, Michelle. The package has markings similar to the pipe bomb packages recently mailed nationwide to top Democrats, two law enforcement sources said.
Mrs Clinton thanked the Secret Service and said she and her family "are fine". Biden's home was also searched for explosives. Those contained "potentially destructive devices", according to the Federal Bureau of Investigation.
What is in the manila envelopes with bubble wrap?
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