Neither the Clintons nor the Obamas had been at risk of receiving the packages because of screening procedures, the Secret Service said.
The Time Warner building in NY was also evacuated due to a package.
On Thursday morning, police were investigating a suspicious package at a building in the Tribeca section of New York City that houses a restaurant owned by actor Robert De Niro, according to NBC's New York affiliate.
A US official told The Associated Press that investigators believe the explosive that was discovered near the Clintons' home was linked to one found Monday at the Soros compound.
CNN, labeled the "mainstream liberal media" by proponents of the political right in the USA, announced on its screens on Wednesday that it had evacuated its NY building over a suspicious package similar to those addressed to the two former high-ranking Democrats and their donor.
"These terrorising acts are despicable, and anyone responsible will be held accountable to the fullest extent of the law".
For President Donald Trump, the pipe bombs sent to prominent Democrats this week appear to only be about spoiling a Republican Party on cruise control.
A suspicious device also was found addressed to CNN in the mail room at the Time Warner Center in Manhattan where the news network has offices.
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"So far the devices have been what appeared to be pipe bombs", John Miller, the NY police deputy commissioner for intelligence and counterterrorism, told a news conference.
Not long after, he referred to his 2016 opponent as "Crooked Hillary Clinton", prompting a round of "Lock her up!" chants.
The first crude bomb to be discovered had been delivered on Monday to the NY compound of George Soros, a liberal billionaire and major contributor to Democratic causes. The five packages discovered Wednesday all had a similar address: That of Democratic Congresswoman Debbie Wasserman Schultz, but with her name misspelled.
By putting the word "bomb" in quotation marks, the president appeared to question whether the devices, which federal experts say were not capable of exploding, meet the definition of a bomb.
The device sent to Time Warner Center was constructed with a pipe and wires, according to an NYPD source. The packages were respectively addressed to the residences of Mr Obama in Washington and Mrs Clinton in Chappaqua.
A suspicious package was also sent to the White House, however, was intercepted at an off-site facility.
"The people of NY city will not be intimidated", de Blasio said.