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One Direction's Niall Horan has apologised to fans after he was caught on camera joking around with fans and using vulgar language.

Niall swore at a group of girls when he arrived at Dublin Airport in his native Ireland on Monday (2 July) after they asked him to pose for pictures as he walked through a terminal.

He said, "Remember the last time I walked down here? You shower of c**ts!"

Watch: Niall Horan Swearing at fans!

Horan's publicist Simon Jones insisted the comment was "clearly a joke", and now the 18 year old has addressed the controversy on his Twitter.com page.

In a series of posts, he writes, "really sorry if I caused any offence. It was just banter with fans who I think of more as mates but I understand that it's not a word I should be using at all."

Were you offended by Niall's language?