Biden on bomb threats: 'This ugliness has to end'
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Former Vice President Joe BidenJoseph (Joe) Robinette BidenTrump stokes new unlikely feud Sanders on 2020 White House bid: 'We're looking at it' Dems wonder if Sherrod Brown could be their magic man 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 WarrenOn The Money: Senate banking panel showcases 2020 Dems | Koch groups urge Congress not to renew tax breaks | Dow down nearly 400 | Cuomo defends Amazon HQ2 deal Election Countdown: Florida fight ends with Scott, DeSantis wins | Dems see Sunbelt in play for 2020 | Trump to campaign in Mississippi ahead of runoff | GOP wipeout in Orange County | Ortiz Jones concedes in Texas House race Sanders on 2020 White House bid: 'We're looking at it' MORE (D-Mass.) thanked law enforcement and warned that such violence "has no place in our democracy."

Sen. Bernie SandersBernard (Bernie) SandersOvernight Energy: EPA official steps down after indictment on ethics charges | Sanders to hold town hall on climate | Zinke slams 'environmental radicals' for fires Sanders to host town hall on climate change Sanders on 2020 White House bid: 'We're looking at it' 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 BookerElection Countdown: Florida fight ends with Scott, DeSantis wins | Dems see Sunbelt in play for 2020 | Trump to campaign in Mississippi ahead of runoff | GOP wipeout in Orange County | Ortiz Jones concedes in Texas House race Booker to make second visit to New Hampshire in weeks Sanders on 2020 White House bid: 'We're looking at it' 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 ClintonPaul Ryan defends Navy admiral after Trump's criticism Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation Questions grow about FBI vetting of Christopher Steele’s Russia expertise 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 Clinton'Vice' director Adam McKay torches Bill Clinton, would choose Trump over Bush Gorka: John F. Kennedy wouldn't be allowed in Democratic Party Election Countdown: Abrams ends fight in Georgia governor's race | Latest on Florida recount | Booker, Harris head to campaign in Mississippi Senate runoff | Why the tax law failed to save the GOP majority 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 BrennanPaul Ryan defends Navy admiral after Trump's criticism Ex-CIA chief rips into Trump: You’d need ‘an extremely tall ladder’ to reach intellect and integrity of McRaven Retired lieutenant general tears into Trump over attacks against Navy SEAL: 'Disgusting' 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 WatersHouse Democrat agenda, led by minimum wage, threatens economic prosperity Community banks a bipartisan touchstone for new Congress Dem women rally behind Pelosi MORE (D-Calif.), one of Trump's most vocal critics on Capitol Hill.

Former Attorney General Eric HolderEric Himpton HolderEric Holder endorses Pelosi for Speaker Poll: Biden and Sanders lead 2020 Dem field, followed by Beto O'Rourke Trump's shortlist for attorney general takes shape 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 TrumpPaul Ryan defends Navy admiral after Trump's criticism Trump discussing visit overseas to troops following criticism: report Retired Army General: Trump is ‘acting like an 8th grader’ in attacking ex-Navy SEAL who led bin Laden operation 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.