A suspicious package was sent to Robert De Niro’s property in Tribeca — where it may have been sitting in his building’s mailroom for a day or more before being discovered Thursday, according to police sources.

The parcel was addressed to De Niro at his Tribeca Productions company at 375 Greenwich St. — which is also home to his restaurant Tribeca Grill and the Tribeca Film Center — a photo of the package shows.

Police X-rayed it and found it to be “the same” as the explosive devices mailed to top Democrats a day earlier, sources said.

An official said it was suspected to have been delivered earlier this week.

A person affiliated with the Tribeca Film Center was off work when he saw images online of the package containing a crude pipe bomb sent to CNN on Wednesday, two officials told The Associated Press.

The person — who has a background in law enforcement — reported that he had seen a similar package at the film center’s mailroom.

Security personnel at Tribeca Productions — a film and TV production company co-founded in 1989 by De Niro at the same location — notified police of the package at about 5 a.m., a law enforcement source told The Post. It was found on the seventh floor, police said.

“They (police) took it out and went through all safety procedures. It was addressed to Robert De Niro and is similar packaging to the others,” a Tribeca spokesperson told The Post. “It is an open investigation. Everyone is safe and the building is open.”

The package was located on the seventh floor of 375 Greenwich St, police said. There was no need for an evacuation because the building was unoccupied.

The package had a return address of the Florida office of Rep. Debbie Wasserman Schultz, former chairwoman of the Democratic National Committee.

Suspicious packages sent Wednesday to prominent Democrats also included her return address. It was unclear if her name was spelled incorrectly, as it previously had been.

The NYPD Bomb Squad removed the device at 6:30 a.m. and transported it to the police range at Rodman’s Neck in the Bronx.

De Niro, a vocal critic of President Trump, unleashed a torrent of obscenities at the commander-in-chief during the recent Tony Awards as he introduced Bruce Springsteen.

“First, I wanna say, “F–k Trump,” the “Raging Bull” star said at Radio City Music Hall in June. “It’s no longer, ‘Down with Trump,’ it’s, ‘F–k Trump’!”

Trump shot back two days later on Twitter.

“Robert De Niro, a very Low IQ individual, has received to [sic] many shots to the head by real boxers in movies. I watched him last night and truly believe he may be ‘punch-drunk,’” he wrote.

”I guess he doesn’t realize the economy is the best it’s ever been with employment being at an all time high, and many companies pouring back into our country. Wake up Punchy!”

De Niro later apologized — not to Trump, but on America’s behalf to Canadian Prime Minister Justin Trudeau, whom the president had insulted as “very dishonest & weak” after Trudeau threw shade on the president’s trade policies.

De Niro is a seven-time Academy Award nominee, and won Oscars for playing Vito Corleone in “The Godfather Part II” and Jake LaMotta in “Raging Bull.”

In 2009, he was among five recipients of the Kennedy Center Honors, presented by President Barack Obama.

De Niro’s reps did not immediately respond to requests for comment by The Post.

The package sent to De Niro was the eighth explosive device found so far this week.

Pipe bombs also have been sent to Obama, Hillary Clinton, along with billionaire George Soros and CNN’s Manhattan bureau. The one sent to the news outlet was addressed to former CIA Director John Brennan.

Another was sent to former US Attorney General Eric Holder, though it wound up being “returned to sender” — the Florida office of Wasserman Schultz, according to the FBI.

Police also found two suspicious packages addressed to Rep. Maxine Waters at a congressional mailing facility in Maryland.