U.K. police to contact more than 50 people accused of being at Downing Street parties

More than 50 people believed to have attended lockdown parties at British Prime Minister Boris Johnson's Downing Street will be contacted by police to explain their involvement, officers said on Wednesday, as they considered widening their investigation.

A statement from London's Metropolitan Police said officers would start contacting people from the end of this week, asking them to complete a document with formal legal status on the events that have left Johnson facing the gravest crisis of his premiership.

Police are investigating 12 gatherings held at Johnson's office and residence after an internal inquiry found his staff had enjoyed alcohol-fuelled parties in Downing Street, with the British leader attending a few of the events himself.

At the time, many people could not attend funerals or say farewell to loved ones dying in hospital due to strict COVID-19 lockdown rules, and the revelations have sparked widespread anger.

Some legislators in his own party have joined the opposition in calling for him to quit.

Departures from Downing Street

Johnson has apologized and promised to change the culture at the top of government after the internal inquiry found a "serious lack of leadership." After five aides quit, he has appointed new staff to senior roles.

The internal inquiry had found evidence of 16 parties or gatherings, with the police saying they would examine 12 that appeared to meet the threshold for criminal investigation.

They said on Wednesday they were also now reviewing one of the four other events after a new photograph emerged showing Johnson standing near two members of staff, one of whom is wearing tinsel around his neck, next to an open bottle of champagne.

The revelations around Johnson have raised questions about his judgment after he originally he said there were no parties at Downing Street during the strict lockdowns.

The full internal report by senior official Sue Gray will be published at a later date.