A suspicious package addressed to actor-director Robert De Niro was reported early Thursday at the Manhattan building where his production company is based, and its marking and contents appear similar to pipe bomb packages recently mailed nationwide to top Democrats, two law enforcement sources said.
Investigators are nevertheless treating the devices as "live" explosives, not hoaxes, said James O'Neill, police commissioner of New York City where two of the parcels surfaced.
This story is breaking and we'll have more information as the Federal Bureau of Investigation releases it.
The packages intended for Harris and Steyer were discovered in California and are similar to the other packages, law enforcement sources said. But he said, "Let this be a lesson to anyone regardless of their political beliefs that we will bring the full force of law against anyone who attempts to use threats, intimidation and outright violence to further an agenda".
The mail-bomb spree began on Monday with a device found at the NY home of billionaire liberal donor George Soros.
FBI Director Christopher Wray said Friday investigators had fingerprints of Florida resident Cesar Sayoc and had possible DNA collected from two explosive devices.
The parcel intended for Mr Holder ended up rerouted to the return address printed on all the packages - the Florida office of Ms Schultz.
The packages, containing devices that appear to be explosive devices, began to show up on Monday, starting with billionaire George Soros, a major donor to Democrats and Democratic causes.
The packages addressed to Mr Biden were intercepted at DE mail facilities in New Castle and Wilmington, officials said.
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Video: Authorities continue to investigate additional suspicious packages containing explosives that seem to target prominent liberal figures and Democratic politicians the week of October 22. Details suggest only a broad pattern - that the items were packaged in manila envelopes and addressed to prominent Democrats.
On Friday, shortly before news of the arrest broke, he complained that the packages were slowing momentum for his Republican Party ahead of the November 6 elections, remarks that enraged his opponents.
The devices included very common components, making it more hard to get clues from the signature of the bomb.
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. Maxine Waters of California.
New York City Mayor Bill de Blasio said the packages were "clearly an effort to terrorize people politically, to choose people for political purposes and attack them due to their beliefs". "It has gotten so bad and hateful that it is beyond description". Soros has called Trump's presidency "dangerous".
Mr Clapper said he is not surprised he has been targeted with a suspicious package.
The packages sent to public figures had numerous hallmarks of suspicious mail, including large block lettering and excessive postage aimed at making it harder to track, said Matthew Doherty, who formerly led the U.S. Secret Service's National Threat Assessment Center.
Former vice-president Joe Biden talks with 27th Congressional District Democratic candidate Nate McMurray after greeting workers and patrons in a restaurant Thursday in Lancaster N.Y. Biden called for unity after he was found to be one of the targets of the mail bombs.
An arrest has reportedly been made in connection with the mailing of suspicious packages to Democratic leaders and supporters. Trump said on Twitter on Thursday morning.
"No nation can succeed that tolerates violence", Trump told the audience.
Hours earlier, he took a softer tone at a rally in Wisconsin, telling the crowd his Government would conduct "an aggressive investigation".
"Did you see your face on that van, sir?"