Officials say they found nothing suspicious there.
CNN's NY bureau in the Time Warner Center was evacuated after a package containing a bomb, addressed to former CIA Director John Brennan, was discovered, city and local law enforcement officials said.
Police also intercepted a package addressed to former vice-president Joe Biden this morning. The Bomb Squad placed the package in a containment vehicle and brought it to its detonation facility in the Bronx.
Actor Robert De Niro is the latest target in a series of pipe bomb deliveries sent to Trump critics this week. Debbie Wasserman Schultz, the former chairwoman of the Democratic National Committee.
Most of those targeted this week were past or present US officials, but packages also were sent to actor Robert De Niro and billionaire George Soros.
The FBI confirms there is law enforcement activity at the US mail facility in New Castle, Delaware.
X-ray images show that the package addressed to De Niro contains a device similar to the pipe bombs found in other packages this week that were addressed to prominent Democrats, the two sources said.
Gov. John Carney's office did not have a comment.
The parcels each consisted of a manila envelope with a bubble-wrap interior containing "potentially destructive devices", the Federal Bureau of Investigation said.
The investigation into a wave of homemade pipe bombs addressed to political enemies of President Trump expanded Thursday with the discovery of more suspicious packages in NY and Delaware.
George Soros: A suspicious package found Monday appeared to be an explosive device targeting the billionaire investor, philanthropist and Democratic donor. CNN said initial tests deemed it was not anthrax but further examination was planned.
The package addressed to De Niro, found on the seventh floor of 375 Greenwich St.in New York City's Tribeca neighborhood, was reported to police around 4:45 a.m.
Another package, sent to former Central Intelligence Agency director John Brennan care of CNN, caused the channel's mail-room to be evacuated on Wednesday. Brennan is a contributor of MSNBC and has written scathing op-eds of President Trump for both The Washington Post and The New York Times but he does not work for CNN.
An initial examination shows they are are rudimentary but functional, and have similar construction.
Law enforcement officials said authorities suspect at least five of the devices - and possibly all of them - were made and sent by the same person or persons. The bombs were unstable and could have been set off just by handling, sources said.
The suspicious devices are either at the FBI Laboratory in Quantico, Va., or on their way there now, authorities say, where the FBI's specialists will reach conclusions as they continue their examinations. Each package had six American flag Forever stamps on the envelope.
The actions, which caused panicked building evacuations and reports of additional explosives that later proved unfounded, are bound to add to fears that overheated rhetoric could lead to deadly violence as the parties engage in bitter fights over immigration, the Supreme Court and the treatment of women.
The devices had suspicious-looking packaging, and at least one had a timer that can be bought for a few dollars online and should be easily detected when mailed or delivered.
The first bomb discovered was delivered Monday to the suburban NY compound of George Soros, a liberal billionaire and major contributor to Democratic causes. "There are a multitude of more sophisticated methodologies that would have worked if they really wanted this to work".
Obama, Clinton, Brennan, Holder and Waters have been the subject of frequent attacks by Trump and other conservatives. "Any acts or threats of political violence are an attack on our democracy itself".
Even as everyone condemned the unknown sender and Trump decried political violence, blame flew for the corrosive nature of America's political conversation. "Those engaged in the political arena must stop treating political opponents as being morally defective", he later told a campaign rally in Wisconsin, before switching his criticism back to the media. Then he resumed his attacks on Democrats, including one falsely claiming they are allowing immigrants to enter the county illegally.
"A very big part of the Anger we see today in our society is caused by the purposely false and inaccurate reporting of the Mainstream Media that I refer to as Fake News", Trump tweeted. "It has gotten so bad and hateful that it is beyond description".
Cavaliers forward Kevin Love out with sore foot
James got Staples Center rocking on a go-ahead dunk with 3:31 to play before Lonzo Ball made an artful step-back 3-pointer. James dominated with 28 points, 11 assists and 11 rebounds in his 74th career triple-double - the first with his new team.
In as much as most movies show how gambling is bad or addictive, look on the brighter side, it is a good way of making money. With so many people shaming gambling, directors are trying to put it out there that it is not as bad as people make it seem.
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