News reported that an "unsubstantiated telephone threat" was called into the network by a person who said there were 5 bombs in the building.
Numerous police and fire department trucks have blocked all vehicle and pedestrian traffic on West 58th Street between 8th and 9th Avenue due to a police investigation at Columbus Circle, where the Time Warner Center is located, the New York Police Department tweeted.
It didn't take long for some people to link the bomb threat to US President Donald Trump and his war of words with mainstream media.
"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 call was made at around 10pm Eastern time (3am Friday morning United Kingdom time) as CNN switched briefly to pre-taped programming before cutting to live shots of newscasters, employees and onlookers standing behind police barricades outside the building.
CNN anchor Don Lemon told his Twitter followers the studio had been evacuated in the middle of recording his show.
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Members of the NYPD's Emergency Services Unit swept the building and gave the all-clear shortly after midnight, reopening it for occupation.
"It's kind of a repeat situation of what we went through in October", Lemon said on CNN.
Security officers evacuated the building as a precaution and called police.
In a tweet, CNN's Brian Stelter said the office had been evacuated.
In October, the building was partially evacuated after a suspicious package containing a crude pipe bomb was delivered to the company.
'FAKE NEWS - THE ENEMY OF THE PEOPLE, ' Trump tweeted just after 10pm.