Edward Snowden during interview with data illustration
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The Snowden leaks explained

30 October 2013 Last updated at 00:19 GMT

The leaking of classified documents by former CIA and NSA contractor Edward Snowden continues to ignite controversy.

Since late May, a variety of news outlets have reported on the contents of those documents.

The BBC takes a look at just exactly what allegations have been levelled so far - and what response, if any, the US has given.

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