Brian Williams stays cool during 'Nightly News' fire alarm

Brian Williams, you're a pro.

A terribly timed fire alarm announcement went off just seconds after his show "Nightly News" hit the air last night, interrupting Williams' intro of the lead story.

The newsman quickly apologized and said there's no danger, and moments later deadpanned, "We'd love to make this stop," throwing the feed to show's Washington bureau.

The possible drill went on for much of the show, eventually ending close to the show's close.

Well done, Bri.