CNN's office building in New York was evacuated Wednesday morning.

"CNN New York was just evacuated. Police everywhere," said CNN newswriter Eric Levenson on Twitter.

CNN head Jeff Zucker said in an companywide email that the evacuation took place "out of an abundance of caution" and that they were checking "all bureaus around the world" for any other issues.

New York Police Commissioner James O'Neill said in a press conference that an envelope with "white powder" was also found in the packaging. He said that the package appeared to contain "a live explosive device."

CNN's offices are located in the Time Warner Center in Manhattan, by Central Park, and CNN reported that several floors of the building were evacuated.

Based on three unnamed sources, CNN said that the package sent to the New York headquarters was address specifically to former CIA Director John Brennan, a contributor to NBC and a harsh critic of President Trump.

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Here’s the note Jeff Zucker sent to all CNN employees pic.twitter.com/luAVbf4lBL — Oliver Darcy (@oliverdarcy) October 24, 2018

CNN reported that personnel had been told there was a "suspicious package" identified on the premises, in the mailroom. Zucker said in his companywide note that this was the case.

Initial reports that another suspicious package addressed to the White House were deemed false by the Secret Service.

A source at CNN told the Washington Examiner that D.C.'s bureau had not been evacuated and that it was screened twice for any potential threats with none found. The source said that Atlanta's bureau had also not been evacuated.

Similar packages were also delivered to the homes of former presidential candidate Hillary Clinton in New York and former president Barack Obama in Washington. A package that was intended for the home of former Attorney General Eric Holder was also reportedly found, though it was labeled with the wrong delivery address.

New York Gov. Andrew Cuomo said during a press conference that a similar package was also sent to his office and that it was being handled by authorities.

The White House released a statement that said, “We condemn the attempted violent attacks recently made against President Obama, President Clinton, Secretary Clinton, and other public figures. These terrorizing acts are despicable, and anyone responsible will be held 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.”

The San Diego Union-Tribune, a local newspaper in the city, reported Wednesday that the block surrounding its office building had been cordoned off by police "after a stack of suspicious looking packages were spotted" on top of a trashcan nearby. That office building reportedly also houses a field office for Sen. Kamala Harris, D-Calif.

A potential explosive was also found Monday near the home of liberal philanthropist and political activist George Soros.