Police investigate suspicious package addressed to Robert De Niro in Tribeca

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.

Also Thursday, two suspicious packages addressed to former Vice President Joe Biden were found in Delaware, law enforcement officials said.

PHOTO: Obtained by CNN

A photo of the package sent to Robert DeNiro, provided by a law enforcement official.

With Thursday’s discoveries, at least 10 suspicious packages, all similar in appearance, have been found this week addressed to eight people who are prominent Democrats or high-profile critics of Donald Trump.

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.

LIVE UPDATES: At least nine suspicious packages addressed to Trump critics

The building contains Tribeca Enterprises – which includes De Niro’s Tribeca Productions film and television company and organizes the Tribeca Film Festival – and De Niro’s Tribeca Grill restaurant.

The package was received in the building’s general mailroom on Wednesday, according to a law enforcement official. A retired police officer discovered the package, but initially didn’t think anything of it and left it in his office.

After watching news reports, he recognized similarities between the package he had seen and the others sent to top Democrats and CNN, the official said. He called police early Thursday morning to inform them about it.

Police have sent the package to a secure facility in the Bronx, New York Police Department Commissioner James O’Neill said on Twitter.

PHOTO: TIMOTHY A. CLARY/AFP/Getty Images

Police patrol outside the Time Warner Building on October 24, 2018 where a suspected explosive device was found in the building after it was delivered to CNN's New York bureau. - Suspected explosive devices were sent to former president Barack Obama, defeated presidential nominee Hillary Clinton and to a building housing CNN's New York bureau less than 24 hours apart and less than two weeks before key US midterm elections, officials confirmed Wednesday. The targeted Democrats are among the most high-profile political figures in the United States, which goes to the polls on November 6 in elections seen as a referendum on Republican President Donald Trump. (Photo by TIMOTHY A. CLARY / AFP) (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

Related Article Who got what, when: A timeline of when the bombs were found

“The most highly trained experts in the world are investigating today’s suspicious package in #TriBeCa,” O’Neill’s tweet reads.

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.

De Niro is a vocal critic of Trump.

03:43 - Source: CNN

Attorney: Sayoc found a father in Trump

PHOTO: CNN

mail bomb suspect attorney

Now playing

03:43

Attorney: Sayoc found a father in Trump

PHOTO: CNN

Now playing

02:42

Trump's rhetoric on suspicious packages

PHOTO: CNN

rochelle ritchie

Now playing

02:45

Woman warned Twitter about bomb suspect

PHOTO: CNN

Now playing

02:23

Trump: Media using mail bombs for political gain

PHOTO: WPLG

sayoc perp walk

Now playing

00:30

See suspect in police custody

PHOTO: Broward County Sheriff

Now playing

01:09

Listen to police audio of Cesar Sayoc arrest

PHOTO: CNN

Debra Gureghian store manager EBOF

Now playing

01:50

Suspect's manager: He told me to burn in hell

PHOTO: CNN

Christopher Wray explosives presser 10262018

Now playing

01:16

Wray: 13 bombs sent are not hoax devices

PHOTO: WPLG/Broward County Sheriff's Office

Now playing

01:48

See pro-Trump stickers on bomb suspect's van

PHOTO: Broward County Sheriff's Office

Now playing

03:37

See suspect's disturbing social media posts

PHOTO: Anthony Lanzilote/Bloomberg/Getty Images

Tom Steyer, co-founder of NextGen Climate Action Committee, attends a "Need To Impeach" event in Detroit, Michigan, U.S., on Monday, Aug. 13, 2018. Steyer plans to spend an additional $10 million on helping Democrats take control of the House by attempting to drive up turnout among infrequent voters motivated by the idea of impeaching President Donald Trump.

Now playing

01:42

Package addressed to Tom Steyer found

PHOTO: Kevin Coombs/Reuters

REFILE-CORRECTING TYPO A member of the New York Police Department bomb squad is pictured outside the Time Warner Center in the Manhattan borough of New York City after a suspicious package was found inside the CNN Headquarters in New York, U.S., October 24, 2018.

Now playing

02:24

What was inside the bombs?

PHOTO: WCBS

Now playing

02:01

New suspicious packages addressed to Booker, Clapper

PHOTO: CNN

Now playing

04:22

Who got what, when: A timeline of when bombs were found

PHOTO: CNN

Now playing

02:16

Sanders: 1st thing CNN did was blame Trump

PHOTO: Kevin Cooms/Reuters

Members of the New York Police Department are pictured outside the Time Warner Center in the Manhattan borough of New York City after a suspicious package was found inside the CNN Headquarters in New York, October 24, 2018.

Now playing

02:33

Bombs sent to politicians in 'act of terror'

PHOTO: CNN

mail bomb suspect attorney

Now playing

03:43

Attorney: Sayoc found a father in Trump

PHOTO: CNN

Now playing

02:42

Trump's rhetoric on suspicious packages

PHOTO: CNN

rochelle ritchie

Now playing

02:45

Woman warned Twitter about bomb suspect

PHOTO: CNN

Now playing