Several explosives have been sent by mail to high-ranking Democrats and Trump critics since Monday, including former President Barack Obama and 2016 presidential candidate Hillary Clinton.

Bomb squads are still investigating a bomb scare at the Sunrise, Florida, office of Rep. Debbie Wasserman Schultz, and a suspicious package intercepted before it could reach Rep. Maxine Waters.

New York City Mayor Bill de Blasio called the incidents part of an “act of terror.”

Multiple pipe bombs were sent in the mail to high-ranking Democrats and critics of President Donald Trump on Tuesday and Wednesday, including former President Barack Obama and former Secretary of State Hillary Clinton.

The Secret Service on Wednesday said it intercepted two explosive devices addressed to the residences of Clinton and Obama. The situation escalated further when CNN evacuated its New York bureau when another explosive was found in their building’s mail room.

Several more incidents followed around the US, including at the offices of Democratic Rep. Debbie Wasserman Schultz, the former chair of the Democratic National Committee; California Democratic Rep. Maxine Waters; California Democratic Sen. Kamala Harris; and New York Gov. Andrew Cuomo.

Early reports indicating a similar package was sent to the White House were later refuted by the Secret Service.

“What we saw here today was an effort to terrorize,” New York City Mayor Bill de Blasio said at an afternoon press conference. “This clearly is an act of terror, attempting to undermine our free press and the leaders of this country through acts of violence.”

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Foto: Police officers in front of property owned by former Secretary of State Hillary Clinton and former President Bill Clinton in Chappaqua, New York, on Wednesday.sourceAP Photo/Seth Wenig

Foto: The FBI released an image of one of the packages on Wednesday, warning that there could be more out there.sourceFBI

From New York to Florida

The multiple bomb scares come two days after a similar device was dropped off in the mailbox outside billionaire Democratic donor George Soros’ home in Katonah, New York. The liberal philanthropist has been the target of several right-wing conspiracy theories.

Katonah is less than 10 miles from Chappaqua, where Bill and Hillary Clinton have their main residence. Hillary was in Florida campaigning Wednesday, but her husband was home, according to a source who spoke with the Associated Press.

A package addressed to Obama’s residence in Washington, DC, was intercepted early Wednesday morning.

Foto: New York police officers outside the Time Warner Center at Columbus Circle on Wednesday in the mist of the bomb scare.sourceAP Photo/Kevin Hagen

Foto: sourceSkye Gould/Business Insider

“The packages were immediately identified during routine mail screening procedures as potential explosive devices and were appropriately handled as such,” the Secret Service said in a statement. “The protectees did not receive the packages nor were they at risk of receiving them.”

The statement added: “The Secret Service has initiated a full scope criminal investigation that will leverage all available federal, state, and local resources to determine the source of the packages and identify those responsible.”

The package discovered at CNN was dropped off by a courier mid-morning and was addressed to John Brennan, who was CIA director under President Obama and who now works as an analyst for MSNBC. Brennan is also a frequent guest on several other news networks, including CNN.

NYPD Commissioner James P. O’Neill said at an afternoon press conference that an envelope with a white powder was also found with the CNN device and is being investigated as well.

Foto: The NYPD bomb squad took the device found at the Time Warner Center to an off-site location to be detonated.sourceWABC

Here's the moment CNN had to handoff to DC and evacuate Time Warner Center in New York pic.twitter.com/TUtnWrss9z — Josh Billinson (@jbillinson) October 24, 2018

A common theme

According to an FBI press release, the packages shared several details, including that they were all sent in manila envelopes with bubble-wrap interior and all were affixed with computer-printed labels and six Forever stamps.

The packages also had Schultz, the Democratic congresswoman, listed as the sender.

That’s why there was a bomb scare at Schultz’s Sunrise, Florida, offices Wednesday morning, when another package, addressed to President Obama’s attorney general, Eric Holder, was returned to sender because of an incorrect address.

Foto: A US Secret Service police vehicle was parked on the street leading to Obama’s home in the Kalorama neighborhood in Washington, DC, on Wednesday.sourceGershon Peaks/Reuters

Another suspicious package, intended for California Democratic Rep. Maxine Waters, was intercepted at a Congressional sorting facility in Capitol Heights, Maryland, but that incident has not been connected to the others yet by the FBI.

California Sen. Kamala Harris’ San Diego offices were evacuated because of several suspicious packages, but they turned out to be safe. New York Gov. Andrew Cuomo said that he received a suspicious package at his Manhattan offices, but that was cleared as well.

At a Wednesday-afternoon press conference, an FBI official said the devices discovered so far appear to be pipe bombs.

The FBI said that the devices meant for Soros, Clinton, Obama, Brennan and Holder were being sent to their Quantico lab for analysis.

“This investigation is of the highest priority for the FBI. We have committed the full strength of the FBI’s resources and, together with our partners on our Joint Terrorism Task Forces, we will continue to work to identify and arrest whoever is responsible for sending these packages,” said FBI Director Christopher Wray.

“We ask anyone who may have information to contact the FBI. Do not hesitate to call; no piece of information is too small to help us in this investigation.”

The FBI press release warns that there may be additional packages.

“The FBI advises the public to remain vigilant and not touch, move or handle any suspicious or unknown packages,” the warning reads.

White House rebuke

In a statement Wednesday morning, White House press secretary Sarah Huckabee Sanders called the bomb plantings “despicable.”

“We condemn the attempted violent attacks recently made against President Obama, President Clinton, Secretary Clinton, and other public figures,” Sanders said. “These terrorizing acts are despicable, and anyone responsible will be help accountable to the fullest extent of the law. The United States Secret Service and other law enforcement agencies are investigating and will take all appropriate actions to protect anyone threatened by these cowards.”

President Trump was relatively late to comment on the case. His first reference to the escalating situation was a retweet of Vice President Mike Pence’s statement on the matter, adding “I wholeheartedly agree!”

Foto: During a 2 p.m. event on the opioid crisis, Trump spoke momentarily about the bomb scares, saying “we have to unify.”sourceEvan Vucci/AP

I strongly condemn the attempted acts of violence against President Obama, the Clinton family, @CNN & others. There is no excuse—America is better than this. Gratitude to the @SecretService and law enforcement for all they do to keep this nation safe. — Ivanka Trump (@IvankaTrump) October 24, 2018

Every day, I am grateful to the women and men of the United States Secret Service. Thank you. — Chelsea Clinton (@ChelseaClinton) October 24, 2018

Thank you to the @SecretService and all law enforcement agencies who responded to this week's incidents. They work tirelessly to keep our country and communities safe. I am forever grateful for their efforts. — Bill Clinton (@BillClinton) October 24, 2018

The president has come under fire in recent days for encouraging attacks on the press.

During a 2 p.m. event about the opioid crisis, Trump spoke momentarily about the bomb scares, saying “we have to unify.”

“We have to come together and send one very clear, strong, unmistakable message that acts or threats of political violence of any kind have no place in the United States of America,” he said.

First lady Melania Trump also weighed in with a statement of her own.

“We cannot tolerate those cowardly attacks and I strongly condemn all who choose violence,” Mrs. Trump said at the press conference.

‘It is a troubling time’

Following the discovery of the bomb at CNN, De Blasio issued a thinly veiled swipe at Trump.

“To all public officials of all partisan affiliations: Don’t encourage violence. Don’t encourage hatred. Don’t encourage attacks on the media. You can disagree, but you have to show respect for people and air your disagreements peacefully,” he said.

Wednesday afternoon, Hillary Clinton spoke at an event in Florida and addressed the mail bombs, while also saying how “grateful” she is every day for the protection of the Secret Service.

Hillary Clinton speaks after explosive device addressed to her home was intercepted. "It's a time of deep divisions, and we have to do everything we can to bring our country together. We also have to elect candidates who will try to do the same." https://t.co/ho9yvpT1w6 pic.twitter.com/J7siDzn3xP — ABC News (@ABC) October 24, 2018

“We are fine because of the men and women of the Secret Service who intercepted the package long before it made its way to our home,” she said.

Clinton added: “But it is a troubling time, isn’t it? And it’s a time of deep divisions and we have to do everything we can to bring our country together. We also have to elect candidates who will try to do the same.”

No one has claimed responsibility for any of the devices.

Read Business Insider’s full coverage of the suspicious packages:

Anyone with information on the packages is being asked to call the FBI at 1-800-CALL-FBI or go to tips.fbi.gov.

Foto: A gate at the Bedford, New York, residence of the billionaire George Soros seen Tuesday.sourceSpencer Platt/Getty