The personal data of 38,000 runners in the London Marathon were accidentally published on the organiser’s website.
A BBC report revealed that the details of runners – including addresses – were available on the website all day on Monday 23 April 2012. The thousands of runners included many celebrities.
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The organisers were not aware of the problem until the BBC alerted them, after a television presenter was contacted by a member of the public who had found her home address.
Nick Bitel, CEO of the London Marathon, told the BBC: "We immediately made sure the glitch was corrected.
"We do not believe this has led to a substantial number of individuals' details being accessed by members of the public."
The Information Commissioners Office (ICO) said: “We’re aware of a possible data breach involving the website of the organisers of the London Marathon. We will be investigating this, before deciding what action, if any, needs to be taken.”