(CNN Business) BBC radio broadcaster Danny Baker has been fired after posting a racist tweet about the Duke and Duchess of Sussex's new baby.

On Wednesday, the BBC Radio 5 Live presenter tweeted a black and white photo of a man and woman holding hands with a chimpanzee in a suit and a top hat, with the caption, "Royal baby leaves hospital."

Amid widespread accusations of racism, Baker deleted the tweet and said he was sorry the "gag" had "whipped some up." He claimed the connotations had not occurred to him because his "mind (is) not diseased."

In a second message, Baker said that the tweet was "supposed to be a joke about Royals vs circus animals in posh clothes but interpreted as about monkeys & race, so rightly deleted. Royal watching not my forte." On Thursday, the broadcaster said he made an "enormous mistake."

A BBC spokesperson said: "This was a serious error of judgment and goes against the values we as a station aim to embody. Danny's a brilliant broadcaster but will no longer be presenting a weekly show with us."