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A running app has exposed the names and locations of spies and military personnel at MI6, the White House and GCHQ - the second such security lapse this year.
Fitness tracking app Polar Flow revealed the whereabouts of 6,400 users exercising at sensitive intelligence and government facilities around the world.
Locations exposed by the software's jogging heat maps include military bases and airfields, nuclear weapons storage sites and embassies.
Finnish software firm Flow, with offices in the UK and New York, said it had taken the app's map function down after an investigation found it harboured compromising data stretching as far back as 2014.
The revelation comes months after a similar app, Strava, exposed the running routes of British and American soldiers in the Middle East and Africa, potentially opening them up to attacks from local militants.
A running app has exposed the name and locations of spies and military personnel at MI6, the White House and GCHQ - the second such security lapse this year. Pictured are jogging routes (purple) around GCHQ, including one taken by a runner who works at the intelligence hub
As part of the new investigation, reporters at Dutch news sites De Correspondentand Bellingcat gathered names of personnel at Government Communications Headquarters (GCHQ) in Cheltenham, MI6 and MI5 in London as well as Guantanamo Bay detention centre in Cuba.
Foreign intelligence agents at Russia's Main Intelligence Directorate and France's Directorate-General for External Security were also found by the team.
Locations were exposed when employees at these facilities used the app's GPS fitness tracking feature with their profile set to public.