However, according to ITV News, the move suggests the Prime Minister is “more likely to be fined” by the Metropolitan Police.
It comes as another report suggests a senior official – responsible for Whitehall ethics – is being fined over the gatherings.
Helen MacNamara, the former assistant cabinet secretary, has been fined after attending a loud “lockdown” karaoke party that included a drunken brawl, the Telegraph claimed Sunday night.
Mr Johnson is among more than 100 to receive a questionnaire sent to him in February.
But the force is not interviewing those who received the form as part of the investigation and could potentially be fined, ITV political editor Robert Peston said.
The Met is investigating 12 events, including up to six, that Mr Johnson is said to have attended.
Mr Peston said the only officers being questioned are “witnesses” whose role is to help police interpret questionnaires submitted by others.
“Paradoxically, that means that (Mr Johnson) is more likely to be fined,” he said.
“The Met does not interview those who have received questionnaires and face fines.”
Should he be fined, serious questions would be raised about whether a sitting prime minister who has broken his own laws can remain in office.
Mr Johnson has been repeatedly urged to quit because of the affair.
It comes after a first round of 20 fixed deposit notices (FPNs) were issued as part of the Scotland Yard investigation, confirming police believe coronavirus laws have been broken at the heart of the government.
The Met declined to comment.
The Telegraph said Ms MacNamara’s karaoke machine was used at a leading campaign for Downing Street assistant Hannah Young on June 18, 2020 – adding that she was among the first people to be fined on Friday afterwards of £50 (Fixed Penalty Notice, FPN) Police concluded she had broken Covid laws.
The event is said to have taken place at the Cabinet Secretary’s office in Whitehall, when all indoor gatherings were banned and the public was told not to sing in public.
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MORE: Downing Street staff ‘to receive first £50 fines for partygates’, with more to come
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https://metro.co.uk/2022/04/03/boris-set-to-avoid-partygate-police-interview-but-fine-looking-more-likely-16398838/ Boris wants to avoid an interview with Partygate police - but is 'more likely' to look good