Andrew Sharp, Meredith Newman, Jeanne Kuang, Jessica Bies, Esteban Parra and Brittany Horn | The News Journal

Damian Giletto, The News Journal

Two suspicious packages addressed to former Vice President Joe Biden were found in two Delaware post offices Thursday morning, one at Quigley Boulevard near New Castle and another at Lancaster Avenue in Wilmington, law enforcement officials confirmed.

Damian Giletto/The News Journal

The news came a day after a number of high-profile Democratic leaders and supporters were targeted nationwide.

The FBI confirmed in a tweet that the packages addressed to Biden, and another sent to actor Robert De Niro, were similar to the crude pipe bombs sent on Wednesday to former President Barack Obama and Hillary Clinton, among others.

Authorities said Wednesday's pipe bombs were packed with shards of glass and were intercepted. None detonated, and no one was hurt, USA Today reported.

Biden spokesman Bill Russo declined to comment and referred questions to the FBI. It was unclear Thursday if Biden was in Delaware or traveling.

A police sweep of Biden's Greenville home turned up nothing on Wednesday, but on Thursday morning, police responded to two post offices in New Castle County.

Delaware State Police confirmed that it responded to the Quigley Boulevard post office in Hares Corner at 5:51 a.m. with FBI special agents, USPS Inspection Service and New Castle County Police.

The agency did not release more details.

Shortly before 10 a.m., a bomb disposal unit left the Hares Corner location, which also serves as a processing facility that at one time handled about 200,000 pieces of mail each weekday.

Staff from Avenue Medical Construction, directly behind the Hares Corner post office, said they were evacuated from the building by police about 6:45 a.m. They retreated to a nearby Wawa until about 9 a.m.

Jennifer Corbett, The News Journal

“It was quite an ordeal this morning. A little scary,” said one employee, who did not want her name used.

The employee double-checked the locks on the back of the building facing the post office just to make sure no one could get in. The heavy, steel loading door would protect them against a bomb, she thought, but not the aluminum loading door. Looking at the post office she said, "normally this place is popping."

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Suspicious packages addressed to Joe Biden in Delaware

The post office has a large campus where mail trucks were pulling in and out all morning. Avenue Medical Construction staff said all the trucks were being searched as they arrived and before they left.

The scene outside the Lancaster Avenue post office in Wilmington was quiet.

Behind the facility, a handful of neighbors and postal employees milled around outside the police tape at the closed-off Chestnut Street office. One woman, who declined to talk to a reporter, greeted an arriving co-worker.

"Just go home," she told him.

Patty Dailey Lewis, executive director of The Beau Biden Foundation, said the organization had not received any suspicious packages Thursday morning. She said the foundation had been in touch with the former vice president's office in regard to security.

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"We have wonderful support and great security," she said. "We are safe."

Jennifer Corbett, The News Journal

Katie Wilson, a spokeswoman for Sen. Tom Carper, said in an email that his office is engaging with local law enforcement to ensure the safety of the senator and his staff.

The office of Rep. Lisa Blunt Rochester received information from U.S. Capitol Police Wednesday about suspicious packages and what to look for, spokesman Kyle Morse said in an email. He said the office is taking precautions and has spoken with Wilmington Police and the U.S. Marshals Service.

#Breaking: A source has just sent me this photograph of a package device intercepted at a Wilmington post office intended for former Vice President Joe Biden. We are trying to confirm with the @SecretService. @FOX29philly REDACTED PIC pic.twitter.com/lAd7e1l8IY — Chris O'Connell (@CoconnellFox29) October 25, 2018

Police said Thursday morning that a suspicious package was also sent to a building in New York City that houses the Tribeca Grill, started by actor De Niro, and his Tribeca Film Center, according to USA Today.

Just before noon Thursday, the Cannon House Office Building in Washington D.C. was briefly evacuated.

Matt Doc, a Delawarean who works in the building for Congresswoman Debbie Dingell, a Michigan Democrat, was in the building at the time of the evacuation.

"Yes, I’m safe, I work in Cannon and was in my office when the alarms went off and we just left the building immediately. We’re about a block away," Doc responded in a tweet to a CNN reporter.

In another post, Doc retweeted that the United State Capitol Police were investigating.

Capitol Police and the Architect of the Capitol investigated the issue and determined a malfunctioning electrical panel was the cause, according to the Roll Call. There were no reports of smoke or fire, according to a Capitol Police statement.

A series of devices discovered throughout the day Wednesday, which included pipe bombs, were sent to prominent Democrats and across the country and to CNN's New York office.

Obama and Clinton received threats. Packages were also sent to Rep. Debbie Wasserman Schultz, liberal philanthropist George Soros and California Democratic Congresswoman Maxine Waters.

The explosive sent to CNN prompted the evacuation of the Time Warner Center in Manhattan, where CNN has offices.

Biden commented on the suspicious packages at a recent appearance at the University at Buffalo Thursday night in Buffalo, New York.

"My hope is that this recent spate of these — who knows exactly what they were — these pipe bombs being mailed might wake everybody in my business up a bit and realize that we have to begin to put this country back together again," he said.