A 17-year-old boy has been arrested on suspicion of malicious communications, after he reportedly sent an abusive tweet to Team GB diver Tom Daley.
After coming fourth in the men's synchronised 10m platform diving event on Monday, Daley received a message from Twitter user @Rileyy_69, telling him he had let down his father. Daley's father died in May 2011 from brain cancer.
Daley retweeted the message to all of his followers, commenting "After giving it my all...you get idiot's sending me this..." and received a flood of supportive messages from fans and other competitors.
The user later posted a tweet apologising for the comment before his Twitter account was suspended.
"I'm sorry mate i just wanted you to win cause its the olympics I'm just annoyed we didn't win I'm sorry tom accept my apology," it said.
Dorset Police said the teenager was being held at a guesthouse in Weymouth, and is currently helping police with their inquiries.
Deputy mayor of the Olympic Village Duncan Goodhew described the behaviour of the Twitter user as "appalling".
"I suppose that social media in one sense is fantastic, but turned the wrong way round it is very, very personal and it destroys people's lives," said Goodhew.
"So I think people should be much more careful about what they say."