None had exploded, and it wasn't immediately clear if they were meant to cause physical harm or simply sow fear and anxiety.
Investigators believe the mailings were staggered.
The official, who viewed X-ray images of the device, wasn't authorized to discuss an ongoing investigation and spoke to The Associated Press on condition of anonymity. The one discovered at a Manhattan postal facility was addressed to Clapper at CNN's address. The CNN package was addressed to former CIA Director John Brennan, who has publicly clashed with Trump and is a regular television contributor.
President Donald Trump said Wednesday during a press conference that "the full weight and resources" of the federal government are being devoted to identifying the person or persons responsible for what the chief executive described as "despicable acts". "The NYPD is on scene, and we [are] working closely with them to take every precaution".
The rebuke from the top Democrat in the Senate came after the second tweet in a week from Trump with misleading information on an issue that Democrats see working to their advantage in the November 6 midterm elections. But with the election just around the corner, there are more ads about health care than ever. But they were uncertain whether the devices were poorly designed or never meant to cause physical harm.
Soros was among those sent suspicious packages by the suspected serial bomber. Debbie Wasserman Schultz, whose return address was on it.
Bolstered by a recent uptick in his job approval ratings to the high 40s in opinion polls, Trump is hammering away at two major themes: illegal immigration and the contentious Senate confirmation battle over U.S. Supreme Court Justice Brett Kavanaugh, who denied accusations of sexual misconduct. The packages were not addressed to Harris or her office. A repeal attempt after Trump took office previous year failed.Opinion polls show Democrats as having a chance to achieve the net gain of 23 seats they would need to take a majority in the House, but facing a longer shot at picking up the two seats they need to take control of the Senate.
When asked if he saw his picture on the suspect's van - something that's been covered by multiple news agencies - the president said he had not.
Mindful of the news, Mr Trump refrained from delivering some of the most pointed riffs of his regular routine, steering clear of two of his favourite targets: Mrs Clinton and California representative Maxine Waters, whose office appears to have been a target of one of the explosive devices.
CNN was the sole media organization to receive such a package, while at least seven other top Democrats and Trump critics got almost identical packages in the mail.
The packages arrived in everyday manila envelopes affixed with lots of stamps, some bearing the American flag.
Nothing seems to be scaring Americans more than the outcome of the midterm elections on November 6. Politicians from both parties used the threats to decry a toxic political climate and lay blame.
Yesterday, without directly referencing the explosive devices, Trump again blamed the media for the "anger" in society.
Brennan replied Trump should stop blaming others and should "Look in the mirror".
The discovery of five pipe bombs mailed to prominent Democrats, CNN and a liberal billionaire put the country on edge Wednesday and sent law enforcement officials scrambling to prevent any more packages from reaching their targets.
The first crude bomb to be discovered had been delivered on Monday to the suburban NY compound of George Soros, a liberal billionaire and major contributor to Democratic causes. Instead, he gave an answer that cast the president in a positive and grateful light, despite Trump's distaste for the Federal Bureau of Investigation and his apparent skepticism about the attacks.