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Up to 30 Tory MPs are set to learn if they will be charged with electoral fraud at 11am today.

Prosecutors are due to make an announcement on files they have received from 15 police forces before Thursday's deadline for candidates to declare whether they will stand in the upcoming election.

A Mirror investigation revealed last March that two dozen Conservative MPs received help from battlebuses packed with party activists during the 2015 general election but failed to declare the cost.

In a follow-up report a six weeks later, Channel 4 News identified a further handful of Tory candidates accused of similar failings.

All deny wrongdoing but face up to a year in jail and an unlimited fine if found guilty of offences under the Representation of the People Act.

The Crown Prosecution Service has confirmed that it received files from a string of police forces but not the number of individual MPs facing possible charges.

(Image: Getty)

The final file, on South Thanet MP Craig Mackinlay, was passed to the CPS by Kent Police on April 18, the day Prime Minister Theresa May called a snap general election.

Mr Mackinlay is standing again and has said: "I have done nothing wrong and acted honestly and properly throughout."

There is a time limit in each case set at one year after judges began giving officers one year extensions to investigate the Mirror's allegations last May.

(Image: AFP)

A CPS spokesman would not comment on any future announcements but the first decision on an individual MPs case must be made by May 20 and the rest by early June.

But the Mirror has learned that the first decision is expected this week, in time for the deadline for candidates to file their nomination papers to stand in the June 8 poll.

None of the MPs accused have given any indication that they intend to stand down. Challenged in the House of Commons on the electoral fraud allegations, Ms May has said she "stands by" all her MPs.

The CPS has received files from Avon & Somerset, Cumbria, Derbyshire, Devon & Cornwall, Gloucestershire, Greater Manchester, Kent, Lincolnshire, Metropolitan, Northamptonshire, Nottinghamshire, Staffordshire, West Mercia, West Midlands and West Yorkshire police forces.