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 serial killer dubbed the "Grim Sleeper" could face the death penalty after being convicted of murdering nine women and a teenage girl.
Britons must have e-passports to visit America or risk being turned away, travellers have been warned.
A manhunt is being undertaken after two men were shot - one fatally - at a residential site on Thursday evening.