PARIS - Pirates off the coast of Nigeria have kidnapped six Russians and an Estonian during an attack on their ship, Bourbon, the French shipping company operating the vessel said on Wednesday.

Another nine crew members were safe and had reached the Nigerian port of Onne, in the oil-rich Niger Delta, said the spokeswoman for Bourbon, which supplies vessels to the offshore oil industry. The seven were abducted on Monday.

Pirate attacks are on the rise in the Gulf of Guinea, which is second only to the waters around Somalia for piracy.

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