Sky News had to stop broadcasting in the middle of an interview after a fire alarm went off.

Presenter Anna Botting was interviewing political correspondent Jon Craig at around 11.15pm on Monday, September 21.

She interrupted Craig as he talked through events in Westminster to say: "Jon Craig, I do apologise, I have to butt in. There is a fire alarm in the area that controls our programming. We'll be back shortly."

She tweeted shortly afterwards to say: "Fire alarm. Stops broadcast. Back soon..."

As of 11.45pm, the show was still not back, although it is not clear what happened.

James Moyse, a journalist at Sky News, tweeted to say: "Coverage of #SkyNews interrupted as @annabotting says that a #fire alarm has gone off in the building that controls programming.

"Studios in #Osterley are new, with regular fire alarm checks - so hopefully nothing too serious. Finger crossed all colleagues are safe!"

According to one viewer, all live Sky programs were affected.

James Kelly, a station director and presenter, said on Twitter just minutes after the alarm went off:

"Well this is interesting!!" he said.

"Seems a fire alarm has been set off in Osterley!! Sky HQ and all live transmission programmes from Sky has had to be cut off air."

Journalist Matthew Keys said on Twitter after the show went off air: "The fire alarm also forced the suspension of live programming at Sky News' sister channel Sky Sports News. Both are running pre-recorded programs that are part of an emergency queue for situations like this."

A number of viewers were left surprised by the disruption and took to social media to discuss it.

Vivien Taylor summed up the thoughts of many when she said: "Let us know how things are. Hope everyone and the building is ok and that it’s just a false alarm!"

Osterley is in west London, about four miles west of Kew Gardens.

Sky began broadcasting at the state-of-the-art, £233 million production studio in 2017.