North Korea: A glimpse inside a secret state

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Two US journalists were detained by the North Koreans on Tuesday while reporting from the China-North Korea border. The BBC's Michael Bristow was also on the border on Tuesday. Here he reports on what he found.

The border between China and North Korea, which stretches for nearly 1,500km (900 miles), is heavily guarded by soldiers from both countries.

Two rivers, the Yalu and the Tumen, act as the border along much of its length. But wire fences have also been erected, sometimes on both sides.