Piracy off West Africa is nothing new. The area, especially in the Gulf of Guinea, has long had a notorious reputation for being the home of pirate gangs that frequently board ships to steal whatever they can — including crews taken ashore and held for ransom.

But a new and more dangerous type of piracy that emerged in late 2010 — when organised gangs began attacking tankers with the sole aim of stealing their high-value cargoes — has maritime security analysts worried.

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