Michael Fowler, founder of US clothing company Solid Gold Bomb has apologised for the offensive slogans on T-shirts advertised for sale on Amazon.
In a statement on the company's website, he said: "I am sorry. As the party responsible within our company for scripting and creating this automated process that created the matched slogans for this "Keep Calm" series, I apologise for the offensive response this has created across the world".
He went on: "Currently, our listings have been fully removed and we are working to delete the entire parody series.
"Rest assured, we do not condone the offence nor do we have any desire to promote it."
More top news
A mild night and another misty, grey start in places in the morning.
John Kelly said he was "broken hearted" by the criticism, adding the president had expressed his condolences "the best way that he could".
A survey by ITV News found Tory activists are surprisingly supportive of the Prime Minister, despite the result of the General Election.