UK senior civil servant Sue Gray's report into Downing Street lockdown parties has been published, British media reported on Wednesday.

The document was handed to British Prime Minister Boris Johnson on Wednesday morning and released half an hour before Prime Minister's Questions in parliament. 

The report stated that the "senior leadership" in Downing Street must "bear responsibility" for the culture in No. 10 during the pandemic.

Gray launched her investigation after media reports of multiple gatherings in Downing Street while COVID-19 lockdown rules were in place.