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World leaders are increasingly concerned by pirates operating off the coast of Somalia.

Warships from several countries have been sent to patrol the Indian Ocean, as the pirates are threatening some of the world's busiest shipping lanes.

Use the map to see how the pirates have affected various countries in video, audio, pictures and text.

When first loaded, the map's focus falls on Somalia where most of the pirates are based. Use the arrow icons to scroll left towards Europe and the United States which are both playing a central role in tackling the problem.

Scroll to the right for a story about the Philippines, which supplies many of the world's mariners.

You can zoom in for more detail by using the "+" or "-" signs on the upper left hand side.