Biden on bomb threats: 'This ugliness has to end'
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Former Vice President Joe BidenJoe BidenBiden bemoans white supremacy in remarks at civil rights movement site Gun control: Campaigning vs. legislating Sunday shows - Guns dominate after Democratic debate MORE on Wednesday called for an end to "division," "hatred" and "ugliness" as Democratic leaders denounced suspected explosive devices mailed to a number of prominent party members including former President Obama.

"This country has to come together. This division, this hatred, this ugliness has to end," Biden wrote on Twitter.

Biden joined a chorus of national Democrats and potential 2020 presidential candidates who spoke out forcefully against the threats against public officials.

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Sen. Elizabeth WarrenElizabeth Ann WarrenGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Democrats spar over electoral appeal of 'Medicare for All' MORE (D-Mass.) thanked law enforcement and warned that such violence "has no place in our democracy."

Sen. Bernie SandersBernie SandersGun control: Campaigning vs. legislating Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate MORE (I-Vt.), another potential 2020 candidate, echoed Warren's message and called the threats "deeply disturbing."

"In this country we battle with words and ideas, not fists and bombs," he tweeted. "Acts of violence, appeals to violence and condoning violence have no place in American society."

Sen. Cory BookerCory Anthony BookerSunday shows - Guns dominate after Democratic debate Booker defends middle-ground health care approach: 'We're going to fight to get there' Sunday shows preview: Democratic candidates make the rounds after debate MORE (D-N.J.) decried the packages as "targeted acts of terror" that showed "despicable cowardice."

The Secret Service said it intercepted explosive devices earlier Wednesday that were addressed to Obama in Washington, D.C., as well as another for Hillary and Bill Clinton the previous day in New York.

Hillary ClintonHillary Diane Rodham ClintonDershowitz: 'Too many politicians are being subject to criminal prosecution' The 13 Republicans needed to pass gun-control legislation Democrats spar over electoral appeal of 'Medicare for All' MORE addressed the bomb threat during a stop in Florida on Wednesday to support gubernatorial candidate Andrew Gillum (D). She lamented the "deep divisions" in politics, and urged Americans to "do everything we can to bring the country together." 

"We also have to elect candidates who will try to do the same," she added.

Bill ClintonWilliam (Bill) Jefferson ClintonWords matter, except to Democrats, when it involves impeaching Trump Appeals court allows Trump emoluments case to move forward Trump commemorates 9/11 with warning to Taliban MORE later thanked law enforcement for its efforts.

Authorities also responded on Wednesday after a suspicious device was mailed to the New York offices of CNN.

The package was addressed to former CIA Director John BrennanJohn Owen BrennanTrump lashes out at former intel officials for criticism of Iran tweet Trailer shows first look at Annette Bening as Dianne Feinstein Webb: Questions for Robert Mueller MORE, who appears occasionally on the network but works as a contributor for MSNBC.

Capitol Police later in the day said they had intercepted a suspicious package mailed to Rep. Maxine WatersMaxine Moore WatersManufacturing group leads coalition to urge Congress to reauthorize Ex-Im Bank Democrats' impeachment message leads to plenty of head-scratching Trump officials vow to reform Fannie, Freddie if Congress doesn't act MORE (D-Calif.), one of Trump's most vocal critics on Capitol Hill.

Former Attorney General Eric HolderEric Himpton HolderEric Holder says Trump is subject to prosecution after leaving office Eric Holder: Democrats 'have to understand' that 'borders mean something' Trump lawyers ask judge to toss out Dems' tax return lawsuit MORE was also the addressee on a similar package, though it was sent to the wrong address.

A similar device was discovered in the mailbox at the home of billionaire philanthropist George Soros late Monday. Soros is an ardent supporter of liberal causes and Democratic politicians, and is the subject of conspiracy theories pushed by some conservative figures.

President TrumpDonald John TrumpHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Celebrating 'Hispanic Heritage Month' in the Age of Trump Let's not play Charlie Brown to Iran's Lucy MORE on Wednesday afternoon called the attacks "egregious" and "abhorrent to everything we hold dear and sacred as Americans." He called for national unity, and said a "major federal investigation" is underway.

"I just want to tell you that in these times, 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 Untied States of America,” Trump said at a White House event where he signed an anti-opioid addiction bill into law.

Some critics have suggested the president has inflamed political divisions by labeling Democrats an "angry mob" and attacking CNN and other outlets as the "enemy of the people."

Republicans and Democrats have been quick to condemn the suspicious packages this week and have called for cooler heads to prevail.