Tom Daley's father Rob died last year from brain cancer
A 17-year-old youth arrested after a malicious tweet was sent to Olympic diver Tom Daley has been issued with a harassment warning.
Dorset police said the teenager was bailed pending an investigation into other communications on his Twitter account.
He was detained at a guesthouse in Weymouth hours after 18-year-old Daley received messages on the social networking site.
Daley and his Team GB diving partner Pete Waterfield missed out on a medal on Monday when they finished fourth in the men's synchronised 10m platform diving event at the Olympics.
Shortly afterwards, Daley retweeted a message from a user which said: "You let your dad down i hope you know that." Daley responded by tweeting: "After giving it my all... you get idiots sending me this..." Daley's father Rob died last year from brain cancer.
A spokesman for Dorset Police said: "The 17-year-old arrested in the Weymouth area this morning, Tuesday July 31, on suspicion of malicious communication has been issued with a harassment warning in connection to tweets to Olympic diver Tom Daley.
"In addition to the warning the teenager has been bailed to return to the police station at a later date whilst Dorset Police investigate other communications on his Twitter account."
It is understood Daley will be advised to keep off Twitter two days before he competes in the individual version of his event on August 10. British Olympic Association chef de mission Andy Hunt claimed the diver received 50,000 tweets on the day of Friday's opening ceremony of London 2012.
Asked if the 18-year-old needed to stay away from the website from now until his next event, Mr Hunt said: "Everyone knows if you use social media extensively, you have to accept you get bad as well as good. Sometimes bad is wholly unacceptable, as we experienced last night, and that's been dealt with by the relevant authorities."
When news of the insensitive tweet spread, the user attempted to apologise. He tweeted: "@TomDaley1994 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." He later added: "please i don't want to be hated I'm just sorry you didn't win i was rooting for you pal to do britain all proud just so upset."