Police have given the all-clear after a phoned in bomb threat forced the evacuation of CNN's offices in New York.

Fire alarm bells rang inside the newsroom to signal an evacuation shortly after 10:30 pm, CNN said on its website, as the network went to pre-taped programing.

An hour later the network was broadcasting from Skype.

“People just tuning in wondering why you’re seeing me on Skype, why there’s such technical difficulties, it’s because we have been taken off the air because a bomb threat was called in to CNN,” said host Don Lemon.

“We were evacuated and we know as much as you do.”

“Due to a police investigation at Columbus Circle, West 58th Street between 8th and 9th Avenue is closed to vehicle and pedestrian traffic,” the New York Police Department tweeted, referring to the address of the news organization’s offices. 

The bureau was previously evacuated in October after a package with an explosive device was discovered.

From :Arabnews