Citizens of 12 countries singled out at US airports, document shows

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Leaked document shows passengers from countries including Cuba and Iran face additional screenings

Citizens of 12 countries around the world, including Cuba, Iran and Syria, are automatically subjected to extra screening at US airports unless they have been specifically cleared, according to a leaked document from the Homeland Security department.

The disclosure is part of an embarrassing array of information to have reached the public after guidelines issued to security officers at airports were posted online. The breach has led to five transport officials from the Transportation Security Administration which posted the document being suspended from duties while an investigation is carried out.

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