Ukip has claimed "cock-up rather than conspiracy" after it tweeted a photo said to show campaigners in Stoke when they were actually in Bolton.
The party's Twitter account pictured its "people's army" gathered in a car park with "Vote Ukip" placards, adding they were in the West Midlands city to aid leader Paul Nuttall's bid to become MP for Stoke-on-Trent Central.
But other Twitter users insisted the location was more than 50 miles away near the Macron Stadium, home to Bolton Wanderers and the venue for Ukip's spring conference on Friday.
Ukip said the error was caused following a mix-up with its digital team, with a spokesman stating the photo was taken before activists set off to Stoke.
The controversy comes after a week in which Paul Nuttall was forced to apologise for claiming he knew victims in the Hillsborough tragedy.
UKIP's party's leader Paul Nuttall has faced fresh questions about claims made on his website.
He's hoping to take the Stoke-on-Trent Central seat from Labour in Thursday's by-election.
But he faced further claims about inaccuracies on his website after a training charity denied an assertion on his website that he had been on its board.
His website, which has been taken down for "scheduled maintenance" after it emerged that claims he lost "close personal friends" in the Hillsborough disaster were false, suggested that he was joining the board of the North West Training Council (NWTC).
A press release from September 2009 said the North West England MEP was invited to the post after accepting an invitation to visit the NWTC.
"They are doing a first-class job and I am thrilled at the honour of being a board member," Mr Nuttall said.
But the organisation's chief executive, Paul Musa, said Mr Nuttall had never served on the board.
He told the Guardian: "Mr Nuttall was never invited to become a board member of NWTC as this would need to be a directive of the NWTC board, who he never met."
A Ukip spokesman said he was "rather surprised that this has just cropped up" and insisted the press release was put out with NWTC's knowledge.
"If it had not been accurate, don't you think it would have been complained about at the time?" the spokesman said.
Members of UKIP stood and applauded their embattled leader Paul Nuttall at the party's Spring Conference.
There was anger this week when it emerged claims on his website that he lost close friends at Hillsborough were in fact false.
But today the politician from Bootle hit out at what he called a "smear campaign" against him, after some claimed he wasn't at the disaster at all.
Nigel Farage has described multi-millionaire Ukip backer Arron Banks as a "good friend" despite his Hillsborough gaffe comments.Read the full story ›
UKIP Leader Paul Nuttall will face his party for the first time today since the revelations of false claims made about Hillsborough.
The party faithful will be in Bolton as the UKP Party Conference gets underway.
Mr Nuttall came under fire after he was forced to apologise about false claims that he lost close personal friends in the disaster.
They were posted on his website, though UKIP press officer Lynda Roughley has said she was "entirely responsible" for the website post and had offered her resignation.
Mr. Nuttall is just days away from contesting a Parliamentary by-election in Stoke-on-Trent,
Paul Nuttall's website has been taken offline days after criticism for posts which wrongly claimed he lost close friends at HillsboroughRead the full story ›
There is growing pressure on the UKIP party leader Paul Nuttall after it was revealed claims he made about losing a close friend at Hillsborough were false.
Mr Nuttall has apologised, and said he hadn't read the claims on his website.
Meanwhile, UKIP's financial backer, the businessman Arron Banks, has been tweeting about it claiming the families have been milking the disaster and he describes it as an accident.
Our correspondent Elaine Willcox has tonight's top story.
Paul Nuttall has kept on a colleague who took the blame for a false claim he lost "close personal friends" in the Hillsborough disaster.Read the full story ›
Ukip donor Arron Banks has Tweeted a bizarre string of comments about the Hillsborough disaster.
It comes after Ukip leader Paul Nuttall admitted that he didn't have close friends who died at the disaster.
Steve Kelly, who lost his brother Michael at the Hillsborough disaster said:
I'm appalled by Nuttall's comments. If he was there why didn't he support the campaigning for answers.
I also finds Arron Banks's comments hugely offensive and ill informed.
At a time when the families of the victims are waiting to see whether the Crown Prosecution Service will prosecute those responsible, comments like these are not helpful
Ukip leader Paul Nuttall has said he is very sorry over a false claim that he had lost close personal friends in the Hillsborough disaster.Read the full story ›