The illegal voting is alleged to have taken place in Eynesbury, St Neots, where Conservative Councillor Andrew Hansard retained his seat on Huntingdonshire District Council.

It is claimed the two youths received voting cards, showed passports to confirm their identity and insisted on casting their ballot.

A police spokeswoman said: "An allegation of electoral fraud at the local elections in St Neots has been referred to police by Huntingdonshire District Council and is being investigated."

Last year the Town Crier reported on seven-year-old Keiron Wiles, of Walnut Tree Drive, Huntingdon, who was mistakenly sent a polling card by Huntingdonshire District Council.

At the time the council claimed it was unlikely they had made the mistake, and that the information on the electoral register is provided by each individual household.

A spokeswoman for Huntingdonshire District Council explained that if the latest allegation was proven it would be the first time in the country anyone under the legal age of 18 had been mistakenly allowed to cast a vote.

She said: "We have spoken to the police and given them details, and the police are investigating it at the moment.

"We do take it seriously. It is a criminal offence for anyone under 18 to vote. We are just trying to find out how this happened and from our side how we managed to let that one slip."