Photo: Peter Summers/Getty

Boris Johnson

U.K. Prime MinisterBoris Johnsonhas been fined for parties held in his Downing Street offices at the height of the country’sCOVID-19lockdowns.

In astatementshared Tuesday, Johnson said he “received a fixed penalty notice from the Metropolitan Police relating to an event in Downing Street on 19th June 2020,” adding that he paid the fine “immediately” and issued an apology.

“In a spirit of openness and humility, I want to be completely clear about what happened on that date,” he continued, noting the eight meetings he oversaw at Downing Street (a.k.a. Number 10) that day, which included a committee sit-down about a plan for COVID-19. Johnson, 57, added that he left Downing Street for several hours to visit a school in Hemel Hempstead.

“And amongst all these engagements, on a day that happened to be my birthday, there was a brief gathering in the Cabinet Room shortly after 2pm, lasting for less than 10 minutes, during which people I work with kindly passed on their good wishes,” he explained.

British Prime Minister Boris Johnson.OLIVIER DOULIERY/AFP via Getty

Boris Johnson

“And I have to say in all frankness, at the time, it did not occur to me that this might have been a breach of the rules. But of course the police have found otherwise and I fully respect the outcome of their investigation,” Johnson added.

“I will take forward that task with due humility, but with maximum determination to fulfil my duty and do what is best for the country I serve,” Johnson concluded.

Metropolitan Police in London said its “Operation Hillman” probe resulted in more than 50 fines amid investigations into parties held at government buildings in Downing Street and Whitehall,CNNreported.

RELATED VIDEO: Justice Clarence Thomas' Wife Was at Jan. 6 Trump Rally but Says She ‘Played No Role’ in Riots

Metropolitan Police did not immediately respond to PEOPLE’s request for comment.

In January,leaked emailsfrom Johnson’s office revealed that 100 members of the Downing Street staff were invited to a “bring your own booze” party at his offices in May 2020. At the time, the U.K. was under its first COVID-19 lockdown and people in London were only allowed to meet with one person at a time in an outdoor setting.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

The revelation of the party led to calls for Johnson to be questioned as part of an ongoing inquiry into allegations that at leasteight other partieswere held at Downing Street while the rest of the U.K. population was inlockdownto slow new infections amid the pandemic.

source: people.com