Labour has suspended parliamentary candidate Kevin Craig after being told the Gambling Commission has launched an investigation into him.
It is understood the probe is not linked to alleged bets on the election date, but that he is suspected of betting on the election result in the Central Suffolk and North Ipswich, where he was standing.
It comes after Welsh Conservative Russell George became the latest Tory to be investigated over alleged bets on the timing of the election, along with five more police officers.
An officer who worked in Rishi Sunak’s close protection team was previously arrested on a misconduct in public office offence over alleged bets.
In a statement on Tuesday, the Met said it had been passed information from the Gambling Commission alleging that five further officers have placed bets related to the timing of the election.
Some of the five other officers are based in specialist royal and parliamentary units, the force said. None have been arrested.
The latest revelation came after the Conservative Party dropped its support for two candidates being probed in the election date betting scandal.
Rishi Sunak’s former parliamentary aide Craig Williams, a candidate in Montgomeryshire & Glyndwr and Laura Saunders, a candidate in Bristol North West were both named as being investigated for allegedly placing bets on the election dates.
In a statement, a Tory spokesperson said it "can no longer support" either candidate, although they will still appear on the ballot as Conservative candidates as the deadline for changes has passed.
