Tonight’s planned live episode of NBC comedy series Undateable won’t air in light of the terrorist attacks in Paris. A repeat will run instead, the network said. The show’s cast and writers this afternoon posted messages of support to the victims of the attacks.

Also at NBC, NBC News has taken Dateline’s 10 PM time slot to cover the attacks in the French capital today. The show, Special Live Edition Of Dateline: Terror In Paris, will be updated for the West Coast broadcast.

ABC’s primetime Friday newsmagazine 20/20 is also doing a special edition, Paris Under Attack, which also will air at 10 PM with World News Tonight anchor David Muir and Elizabeth Vargas fronting live coverage.

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On CBS, the network is boosting its CBS Evening News With Scott Pelley an hour. Fox has allowed its affiliates to carry sister network Fox News’ live coverage from Paris during primetime.

Broadcast news divisions called “all hands on deck” today according to sources, as they worked furiously to cover the story while not getting trapped into making statements that could not be verified. “It’s complete mayhem here,” said one Big Four news division source in the thick of it this evening. In addition to covering the events on the ground in Paris, the nets were also scrambling to look smart about the implications for the U.S.

NBC News’ veteran foreign affairs correspondent Andrea Mitchell early on opined that the attacks wry a devastating blow to U.S. intelligence, probing once again that “we don’t know what we don’t know” despite the masses of information gathered in the wake of 9/11.”