UPDATE: CNN staffers returned to the network’s New York building after a phoned-in bomb threat forced evacuation during a live telecast, forcing the network to switch to taped programming.

“The NYPD has now given us the all clear, and employees have been permitted to return to the building,” CNN Worldwide president Jeff Zucker said in an internal memo to staff. “The building is secure and safe for everyone to return in the morning.”

PREVIOUS: The New York CNN headquarters was evacuated Thursday night after a bomb threat, according to tweets from several of its news people.

It was initially unclear whether the threat was against the news network or targeted a nearby location. New York Police investigated, and CNN aired taped programming while that search continued, but then split to live coverage via Skype on the streets.

Shortly before midnight, the all-clear was given and employees were allowed back into the Time Warner Center. Don Lemon, broadcasting from the street, said the NYPD reported a call came in alleging five bombs planted in the building. Nothing was found after a floor-by-floor investigation.

CNN’s Brian Stelter tweeted that 58th Street, immediately outside the CNN Columbus Circle headquarters, was also closed.

CNN anchor Don Lemon tweeted that CNN’s floor in the Time Warner Center was evacuated in the middle of his nightly live show.