Maidenhead's Olympic hockey player, Hannah Macleod's bronze medal from London 2012 went missing last night after a team celebration in London.
The 28-year-old announced the theft on Twitter last night.
She said: "Had my Olympic medal stolen. I'm not after punishment. If you picked up a bronze Olympic medal that isn't yours please just send anonymously back to GB hockey - Bisham Abbey."
She added: "After a Team GB reception with the Queen at Buckingham Palace, we went to a club in Mayfair where the theft took place between 12am-3am."
Olympic rower Alex Partridge, 31, from Henley, has also reported his bronze medal from London 2012 and Team GB jacket as stolen.
The rower, who won his medal at Eton Dorney, and won a silver medal in 2008, tweeted: "Absolutely gutted to have the medal taken after 12 years of hard work. I hope they can please just give it back."
11.50am: Hannah has released an official statement:
“I’m absolutely gutted that my Olympic bronze medal has been stolen. Winning it in August was an incredible highlight for me and for this to have happened is simply shattering. While it means everything to me it has no value to anyone else and I just hope that whoever took it can hand it in or leave it somewhere that means I can get it back. I just want it back."
She has urged witnesses to phone police on 101 or Crimestoppers on 0800 555111.
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