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

The force said the Gambling Commission has passed information to it about the officers 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 as two Tory candidates, two officials, and the officer are being investigated by the gambling watchdog over the placing of bets on the timing of the election.

Live general election updates

Earlier on Tuesday, the Conservative Party withdrew its support for the two candidates being investigated - Craig Williams and Laura Saunders.

They will still appear on ballot papers as Conservative candidates as it is too late to change them ahead of next Thursday's vote but they will have no support for the rest of the campaign from the party and cannot call themselves Conservatives.

Whether they will remain as Conservatives after the election depends on the outcome of the Gambling Commission's investigation, it is understood.

Image: Tory candidates Craig Williams and Laura Saunders are under investigation. Pics: PA/Laura Saunders for Bristol North West

The move came after Mr Sunak faced nearly two weeks of pressure to suspend them but had previously said he was waiting to see what the commission's investigation came up with.

A Met Police spokesman said: "We previously confirmed the arrest of a Met officer on Monday, 17 June for misconduct in public office in relation to bets placed on the timing of the general election.

"The officer - a police constable from the Royalty and Specialist Protection Command - is on restricted duties.

"It is still the case that only one officer is under criminal investigation.

"We have, however, been passed information from the Gambling Commission alleging that five further officers have placed bets related to the timing of the election.

"The officers are based on the Royalty and Specialist Command, the Parliamentary and Diplomatic Protection Command and the Central West Basic Command Unit. None of them work in a close protection role.

"Decisions on whether they will be subject to any restrictions will be taken in due course."

What is the law around gambling?

There are stricts rules around gambling, with the latest laws updated in 2005.

Section 42 of the Gambling Act 2005 deals with cheating and says a person commits an offence if they cheat at gambling or do "anything for the purpose of enabling or assisting another person to cheat at gambling".

It adds: "It is immaterial whether a person who cheats improves his changes of winning anything, or wins anything."

Cheating is defined as an "actual or attempted deception or interference in connection with the process by which gambling is conducted, or a real or virtual game, race or other event or process to which gambling relates".

Someone found guilty of cheating at gambling can be imprisoned for a maximum of two years and/or fined, or six months in prison for a lesser offence.

Betting with insider knowledge is also not allowed as an MP, with the MPs' code of conduct prohibiting members from "causing significant damage to the reputation and integrity of the house".

Officers in the Royalty and Specialist Protection (RaSP) unit provide personal protection for prime ministers, ministers, royalty, ambassadors and visiting heads of state.

Those in the Parliamentary and Diplomatic Protection Command protect the Houses of Parliament and officers in the Central West Basic Command Unit cover the London boroughs of Westminster, Hammersmith and Fulham, and Kensington and Chelsea.

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