Stoke-on-Trent postal vote errors prompt inquiry
An investigation has been launched after ballot papers were sent in the wrong envelopes to postal voters in Stoke.
Stoke-on-Trent City Council said two wards were affected, but it was unclear how many errors were made.
It means these votes would not be counted in the upcoming local and general elections.
Council leader Mohammed Pervez said it would be resolved with the "utmost urgency".
"Furthermore, there will be an investigation to find out what went wrong and to establish what action is needed," Mr Pervez said.
The city council urged all voters to check their papers and to call the council if they have concerns.
In 2011, the city council sent the wrong polling cards to around 200 voters before a local election, blaming ward boundary changes for the errors.