London-bound swimmers Nick D’Arcy and Kenrick Monk are being investigated by Swimming Australia after posting online ‘‘foolish’’ photos of each other posing with weapons in the United States.

The images appear to have been taken in a gun shop while both athletes were in California for a training camp with fellow Olympic team members Stephanie Rice, Bronte Barratt and Meagen Nay.

Australian swimmer Nick D'Arcy and teammate Kenrick Monk posing with guns in a picture on D'Arcy's Facebook page. Credit:Channel Seven News

The swimmers, who were travelling home to Australia last night, were yesterday ordered under a clause in their Swimming Australia contracts to take down the photos from social media sites Facebook and Twitter and quickly warned similar posts would not be accepted when they join the Australian Olympic team in London.

‘‘These postings today are foolish and clearly inappropriate for members of the 2012 Australian Olympic Team,’’ chef de mision Nick Green said. ‘‘There is no such thing as privacy on social media. Anything that is put up will be in the public domain.