The UK's Metropolitan Police have ended their investigation into violations of the COVID-19 lockdown rules at parties attended by Prime Minister Boris Johnson at Downing Street and Whitehall, the police said on Thursday.

Johnson came under intense fire, including from the members of his own Conservative Party, after being fined for breaking lockdown rules, along with his finance minister Rishi Sunak.

"Our investigation was thorough and impartial and was completed as quickly as we could," Acting Deputy Commissioner of the Met, Helen Ball said.

"This investigation is now complete."

Over 100 people fined

Police said that the investigation had resulted in 126 fines but would not release the identities of those who received them.

Boris Johnson has not received any more fines, however, according to the prime minister's spokesperson. "The Met has confirmed that they're taking no further action with regards to the prime minister," they said.

The police statement pointed to eight events between May 20, 2020, and April 16, 2021, that were determined to have violated the lockdown rules.

Some 53 men and 73 women have been fined with some receiving more than one fine.

The penalties attached to the fines can range from £30 to £10,000 (€35 to €11,800, $37 to $12,400).

The various lockdown parties triggered outrage among large parts of the population Deutsche Welle

What happens next?

With the police inquiry over, it is expected that a report by senior civil servant Sue Gray about the lockdown violations will finally be published.

Lawmakers had called for the report to be released months ago, but its publication was delayed until the end of the police investigation.

The Partygate scandal has rocked the Conservative Party and especially the prime minister who has withstood ongoing calls for him to step down. Johnson is the first UK leader to be convicted of breaking the law while in office.

The scandal has been blamed for the poor results of the party in recent local elections. Some members of the UK Parliament in less safe seats fear that they may not be able to hold on to their constituencies in the next general election.

Opposition leader Keir Starmer said he would step down if police found that he had violated lockdown rules after he was accused of having done so while campaigning in northeast England in April 2021.