A suspicious package and explosive device similar to ones sent to prominent Democrats this week was sent to actor Robert De Niro's Tribeca Grill restaurant, NBC News New York reported on Thursday, citing law enforcement sources.
Separately, NBC News is reporting that law enforcement officials say two suspicious packages, similar to the others, were found Thursday morning at a postal facility in New Castle, Delaware. They were addressed to former vice president Joe Biden.
Late Wednesday, authorities said they believed there was a package somewhere in the postal system addressed to him.
Police also received a call about a package around 4 a.m. Thursday from a building worker at De Niro's restaurant in New York, who remembered seeing it a day or two earlier and realized it was similar to the packages sent to Democratic politicians, according to the report.
There was no need for an evacuation, however, because the restaurant was closed at the time. The New York City police bomb squad removed the package from the building, The Associated Press reported.
In June, De Niro famously slammed President Donald Trump at the Tony Awards, telling the audience, "I'm going to say one thing, 'F— Trump. It's no longer, 'Down with Trump.' It's f— Trump."
New York police also evacuated the Time Warner Center Wednesday to investigate another suspicious package sent to the CNN news offices there, addressed to John Brennan, a former CIA director and frequent Trump critic.
On Monday, a similar device was discovered at the Westchester County home of billionaire Democratic political donor George Soros.
Rep. Maxine Waters, D-Calif., said her office in Washington was also "the target" of a suspicious package on Wednesday, and the FBI later confirmed that another package had been sent to Waters' district office in California.
No injuries from the explosives have been reported so far, but several have been "proactively detonated" by bomb squads, proving that they were intended to harm, and not merely to frighten, their recipients.
The pipe bombs appear to have targeted top Democrats and other public figures who have been outspoken critics of President Donald Trump.
Several of the targets, like Waters and Brennan, only became widely known to the public after Trump singled them out for attacks on Twitter and at his raucous political rallies.
At a rally on Wednesday night, Trump called for a return to "civility." But by Thursday morning, the president was back to blaming one of his most perennial targets, the news media, for the anger which infuses today's politics.
"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."
Brennan, who was targeted with a pipe bomb sent to him at CNN's headquarters, responded forcefully to the president's tweet.
"Stop blaming others. Look in the mirror. Your inflammatory rhetoric, insults, lies, & encouragement of physical violence are disgraceful," Brennan tweeted. "Clean up your act....try to act Presidential. The American people deserve much better. BTW, your critics will not be intimidated into silence."
—CNBC's Kevin Breuninger contributed to this report.