A law enforcement official said suspicious packages addressed to former Vice President Joe Biden were intercepted at DE mail facilities in New Castle and Wilmington and were similar to crude pipe bombs sent to former President Barack Obama, Hillary Clinton and CNN.
It comes after United States police said they were investigating an two more suspicious packages on Friday in NY and Florida, taking the total packages intercepted to 12.
At a press conference Thursday, officials in NY would not discuss possible motives or details on how the packages found their way into the postal system. Cory Booker (D-NJ), former Central Intelligence Agency chief John Brennan, and CNN's New York City bureau have all been sent similar explosives.
On Thursday, two law enforcement officials familiar with the investigation told CNN that the nationwide manhunt for the person or people who sent the potential bombs has led authorities to a mail facility in Opa-locka, Florida.
Hollywood megastar Robert De Niro and former U.S. vice president Joe Biden were the latest targets on Thursday of a spree of 10 devices and pipe bombs sent to opponents of Donald Trump as the president lashed out at the media for stirring up "anger".
Actor Robert De Niro: A suspicious package received at a nonresidential building in NY and addressed to him shows similarities to other pipe bomb packages. None had exploded, and it wasn't immediately clear if they were meant to cause physical harm or simply sow fear and anxiety.
Last February, the favorite actor of filmmaker Martin Scorsese, 75 years old, had even insulted publicly Donald Trump during the ceremony of the Tony awards of Broadway. Most of these explosives are crude pipe bombs coming in a similar kind of yellow packages with a return address of Florida. Several of the packages went through a USA postal facility in Opa-locka, which is less than 10 miles from Aventura.
Packages to Biden were found at two different post offices, one in New Castle and the other in Wilmington.
Former CIA Director John Brennan, the target of a package sent to CNN, fired back.
A similar package was found addressed to De Niro at his production offices in Manhattan, according to law enforcement officials.
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The parcels each consisted of a manila envelope with a bubble-wrap interior containing "potentially destructive devices", the Federal Bureau of Investigation said.
Politicians on both sides of the aisle have branded the packages - intercepted in New York, Maryland, Florida, Delaware and Los Angeles - domestic terrorism, but Trump has come under fire for his response.
In the meantime to find the culprits, the security of many media and celebrities has been enhanced, said the mayor, democrat of New York, Bill de Blasio. The devices have been recovered in New York, Washington D.C., California and South Florida, all with the return address of Debbie Wassermann-Schultz's office.
The chief of police in NY said he is "certain" that the perpetrators would be identified and arrested, but, as his colleague in the FBI, he refused to disclose any information that could be harmful to the investigation.
Brennan responded, tweeting that Trump should "Stop blaming others".
A police truck towed a total containment vessel to a post office in midtown Manhattan to dispose of a suspicious package, today, in NY.
Authorities appealed to the public for tips at a Thursday afternoon news conference in NY.
Wray said each of the 13 IEDs consisted of about 6 inches of PVC pipe, a small clock, a battery, wiring and energetic material. De Niro says he is thankful no one was hurt.
CBS News reported that Sarah Isgur Flores, a Justice Department spokesperson, said that a news conference is scheduled at 2:30 p.m. An earlier package had been sent to former Obama CIA Director John Brennan via CNN in NY.
The packages began to show up on Monday, starting with billionaire George Soros, a major donor to Democrats and Democratic causes.