A retired NY police detective working in security in De Niro's Manhattan office called police after seeing images of a package bomb sent to CNN and recalling a similar package addressed to the actor, officials said. The package was addressed to former Central Intelligence Agency director John Brennan, who has appeared on CNN and MSNBC as a contributor.
Federal agents searched a U.S. mail facility near Miami on Thursday night racing to find who sent 10 pipe bombs to prominent Democrats and critics of U.S. president Donald Trump as leads pointed to Florida as the possible origin of the packages.
Over a 72-hour period, devices were also discovered addressed to prominent liberal critics of President Donald Trump, including former president Barack Obama, former secretary of state Hillary Clinton and Rep.
A bomb addressed to "Former First Lady Hillary Clinton in Westchester County" was found the next day during screening away from the Clinton home while the remaining packages were discovered on Wednesday.
It is not known who is behind the packages or what their political leanings may be.
The bombs overtook other campaign news in an already-tense political season, which has included pitched fights over immigration, the Supreme Court and sexual violence against women. "Clean up your act.try to act Presidential". But Democratic Senate and House leaders Chuck Schumer of NY and Nancy Pelosi of California said such words "ring hollow" when coming from Trump.
"All the bombs have been collected according to a similar pattern and was a pipe cutter, which filled an unknown white powder", said Deputy Commissioner of the NYPD counter-terrorism John Miller.
"Any acts or threats of political violence are an attack on our democracy itself", Trump said.
Hollywood megastar Robert De Niro and former U.S. vice president Joe Biden were the latest targets in a spree of 10 devices and pipe bombs sent to opponents of Donald Trump, but a nationwide manhunt revealed no major public leads Thursday.
"I'm grateful to the Secret Service and federal and local law enforcement for all they do on a daily basis to keep us safe and to encourage people across the country to choose kindness over hatred".
The package was delivered by courier, law enforcement sources said. All of them were sent to people who have criticized or clashed with President Donald Trump, and authorities continued to warn Friday that others could still be out there.
Devices are pieces of pipe with white powder.
Law enforcement officials say the packages are similar manila envelopes with bubble-wrap interior packed with shards of glass, bearing six stamps and computer-printed address labels. Debbie Wasserman Schultz, the former chairwoman of the Democratic National Committee.
The FBI said two suspicious packages were discovered in Delaware on Thursday morning addressed to former Vice President Joe Biden, while a third was found in New York City addressed to actor Robert De Niro.
A bomb squad unit drove through NY after leaving the Tribeca neighbourhood where the package was reportedly found at the Tribeca Grill.
The White House condemned the attempted attacks, saying "terrorising acts are despicable, and anyone responsible will be held accountable to the fullest extent of the law". A fundraising email attacking CNN sent out as the story unfolded deepened that perception.
Other Republican leaders said the same.
The package intended for Holder had the wrong address and was forwarded to Wasserman Schultz. Nor would they say why none of the packages had detonated, but they stressed they were still treating them as "live devices".
Trump said he was briefed by the Secret Service, Department of Justice, Department of Homeland Security and the FBI, and a major federal investigation is under way.
Sweeney said all of the devices were being sent to the FBI's crime lab in Quantico, Virginia, for analysis. It could allow them to assess the sophistication of, and care taken, by the person or persons who built and mailed the bombs.
Another law enforcement source told CNN authorities were investigating a suspicious package intercepted in Burlingame, California, that was addressed to billionaire Tom Steyer, an outspoken Trump critic.