EU citizens have been struggling to vote in today's European elections.
Thousands of angry voters posted on Twitter using the #DeniedMyVote hashtag to report they had been turned away from polling stations, despite believing they had registered to take part.
Cambridge City Council said it regretted that some people had been turned away in the city.
The problem comes down to an additional declaration which must be made by citizens of European nations if they wish to vote overseas.
Issues with overseas postal ballots, used by British Citizens living abroad to vote in elections for MEPs to represent the UK, have also been reported.
The council said 1,825 out of 11,493 registered EU citizens completed the separate form to register to vote from Cambridge. Regrettably, not everyone registered by the deadline, which was set by government, meaning they could not vote.