The package had the same return address as the others, Rep.
De Niro, meanwhile, has said he wants to "punch" Trump "in the face" and even announced he wouldn't let the president eat at a Japanese restaurant he was helping to open. The actor-director hurled profanities at the president in June at the Tony Awards ceremony.
Mr De Niro has been outspoken against Trump and even called him a "national disaster".
Before this package was reported, authorities said pipe bombs stashed in manila envelopes were discovered this week addressed to seven prominent Trump critics: Former President Barack Obama; former Secretary of State Hillary Clinton; former Attorney General Eric Holder; Democratic US Rep. Maxine Waters; former Central Intelligence Agency director John Brennan (sent to CNN's NY offices); former Vice President Joe Biden; and billionaire investor and Democratic donor George Soros.
Police were called at 4:45 a.m. Thursday about the package, which was on the building's seventh floor.
Details about how authorities ultimately found the Biden package on Thursday morning in DE weren't immediately available. Those contained "potentially destructive devices", according to the Federal Bureau of Investigation.
NY police say they're responding to reports of a suspicious package.
Mrs. Clinton was in Florida and thanked the Secret Service for intercepting the package.
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Police found a man matching the description provided by the homeowner inside a black SUV and he was subsequently arrested . The man who called the police hit the intruder in the back with a vacuum tube and chased him out of the house.
The Secret Service intercepted two of the packages, which were addressed to former President Obama's home in Washington and Bill and Hillary Clinton's residence in Westchester County, New York.
The former state secretary said "we are fine" at a Florida fundraiser.
He made no direct reference to the device found at the restaurant, or any of the earlier incidents.
Hillary Clinton: Authorities intercepted suspicious device sent to Clinton's NY suburban home late on Tuesday.
The package contained a device resembling apparent explosives sent to CNN's NY offices and to several high-profile Democrats on Wednesday, according to NBC News. Debbie Wasserman Schultz's (D-Fla.) home-state office. CNN reported that the package was meant for former US Attorney General Eric Holder.
"We are responding to reports of a suspicious package in the vicinity of Greenwich and Franklin streets in Tribeca, Manhattan", said an NYPD statement on October 25.
The bomb squad responded and removed the device, which was placed in an NYPD bomb vehicle to be taken to a safe area.
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The United States can not help provide effective deterrence in Asia as long as we are limited by the INF treaty. And we're not going to let them violate a nuclear agreement and go out and do weapons and we're not allowed to.
While addressing the terror scare during a rally on the evening of October 24, Trump failed to recognize any of the victims by name, simply referring to the Democrats who received suspicious packages as "former government officials". Look in the mirror.
All the people who were targeted are frequently maligned by right-wing critics, including former USA president Barack Obama, former secretary of state and presidential candidate Hillary Clinton and Obama's attorney general Eric Holder.
The devices are believed to be pipe bombs, inherently unstable, and at risk of being set off just by handling.
The news organisation's NY staff were evacuated. The targeted Democrats have all been verbally targeted by Trump in the past, as has CNN, which he's slammed various times for delivering "fake news". "Thus far, they have shown no comprehension of that", he said.
The wave of suspicious packages sent to prominent Democrats and news organizations that have been critical of President Trump - who has also been reliably critical of the media in response - continues.
The FBI has since confirmed that the two packages addressed to Maxine Waters had a similar appearance to the five other packages that were intercepted on the East Coast between October 22 and October 24.
The package had clearly been there since at least yesterday, Fox News reports.
The White House said it condemned the attempted attacks, calling the act "despicable". "Those engaged in the political arena must stop treating political opponents as being defective", he said.
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Yet another device was also reported to have been found in Tribeca, New York at a property that belongs to actor Robert De Niro. Democratic House and Senate leaders Nancy Pelosi and Chuck Schumer both said that conciliatory talk sounds "hollow" coming from Trump.