An investigation by the Cabinet Secretary into possible Covid rule breaches will be extended to a Christmas quiz that took place in Downing Street last year.

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This would make it the fourth gathering to be looked into by Simon Case.

Mr Johnson says he "certainly broke no rules".

What's the row about?
The Daily Mirror first reported that a party took place in Downing Street on 18 December last year.

Downing Street insisted no party took place and that "Covid rules have been followed at all times". A number of ministers appeared on television and radio to repeat the denials.

But a source confirmed to the BBC that there was a party, with "several dozen" people in attendance.

A video - obtained by ITV News - showed a recording of a rehearsal on 22 December for Downing Street's proposed media briefings.

In the video, the prime minister's then-press secretary Allegra Stratton is asked by colleagues about reports of a party. She jokes: "This fictional party was a business meeting and it was not socially distanced."

What were the Covid rules at the time?
At the time of the alleged gathering on 27 November, there was still a national lockdown in force and indoor gatherings were not allowed.

After the national lockdown ended, England returned to its three-tier system of Covid restrictions. The Downing Street Christmas quiz on 15 December occurred while London was in tier 2.

These rules stated that "you must not socialise with anyone you do not live with or who is not in your support bubble in any indoor setting." There was an exception for work that was "reasonably necessary".

A Downing Street source told the BBC that Mr Johnson took part in the quiz virtually and the two other people in the picture were members of the PM's closer staff who had come in to help him with the technology.

Mr Johnson has denied any wrongdoing.