Five more police officers are alleged to have placed bets on the timing of the general election, the Metropolitan Police has said.

The force said it had been passed information about the officers by the Gambling Commission after Rishi Sunak’s close protection officer was arrested last week over alleged bets on a July election.

The Conservatives’ election campaign has been plunged into crisis over the issue, with two Tory candidates and two party officials currently being investigated by the watchdog.