Biden on bomb threats: 'This ugliness has to end'
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Former Vice President Joe BidenJoe Robinette BidenBiden calls for unity, jabs at Trump in campaign launch Here are the potential candidates still eyeing 2020 bids Warren policy ideas show signs of paying off 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 WarrenHere are the potential candidates still eyeing 2020 bids Sanders unveils education plan that would ban for-profit charter schools Warren policy ideas show signs of paying off MORE (D-Mass.) thanked law enforcement and warned that such violence "has no place in our democracy."

Sen. Bernie SandersBernie SandersHere are the potential candidates still eyeing 2020 bids Sanders unveils education plan that would ban for-profit charter schools Warren policy ideas show signs of paying off 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 BookerOvernight Health Care — Presented by Campaign for Accountability — Momentum builds for federal laws enshrining abortion rights | Missouri lawmakers approve bill banning abortions at 8 weeks | Warren unveils plan to protect abortion rights 2020 Dem Seth Moulton calls for expanding cannabis access for veterans Momentum builds behind push to pass laws enshrining abortion rights 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 ClintonWarren policy ideas show signs of paying off Biden at campaign kickoff event: I don't have to be 'angry' to win Top Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem 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 Democratic leaders' impeachment tightrope Several factors have hindered 'next up' presidential candidates in recent years Criminal justice includes food security — we can't ban the social safety net 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 BrennanBrennan hits Trump for calling Mueller probe a 'coup': These are 'sociopathic ramblings' Brennan: Imagine if we had a president 'who did not have to obstruct justice' How I learned to love the witch hunt 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 WatersDemocrats are running out of stunts to pull from impeachment playbook Maxine Waters: Trump 'has done everything that one could even think of to be eligible for impeachment' Maxine Waters: Parts of Trump immigration plan are 'very racist' MORE (D-Calif.), one of Trump's most vocal critics on Capitol Hill.

Former Attorney General Eric HolderEric Himpton HolderEric Holder: 'There are grounds for impeachment' in Mueller report Prosecutor appointed by Barr poised to enter Washington firestorm Dems struggle to make Trump bend on probes 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 TrumpTrump calls for Republicans to be 'united' on abortion Tlaib calls on Amash to join impeachment resolution Facebook temporarily suspended conservative commentator Candace Owens 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.