London police said they will examine a series of parties at Johnson's Downing Street office during the spring and winter of 2020 during the early weeks of the pandemic -- a time when Britons were barred from staging or attending social gatherings.
"I can confirm that the Met is now investigating a number of events that took place at Downing Street and Whitehall in the last two years in relation to potential breaches of COVID-19 regulations," Metropolitan Police Commissioner Cressida Dick said in a statement.
The streets of downtown London are virtually empty on March 27, 2020, after Prime Minister Boris Johnson imposed a national lockdown to control the spread of COVID-19. File Photo by Hugo Philpott/UPI
Dick said officers have looked into several other events that appear to have taken place at the Downing Street and Whitehall locations that have not yet reached a criminal investigation.
"Throughout the pandemic the Met has sought, as I have said, to take a proportionate approach," Dick added. "I should stress the fact that the Met is investigating does not mean that fixed penalty notices will necessarily be issued in every instance and to every person involved.
"We will not be giving a running commentary on our current investigations, but I can assure you that we will give updates at significant points as we would normally do."
"I know that millions of people across this country have made extraordinary sacrifices over the last 18 months. I know the anguish that they have been through," he said.
"I know the rage they feel with me, and with the government I lead, when they think that in Downing Street itself the rules were not being properly followed by the people who make the rules."
Johnson has refused calls to resign, which have come from politicians within and outside his Conservative Party.