LAGOS, Nigeria — Gunmen attacked a ship operated by a French oil and gas services company off the coast of Nigeria's oil-rich southern delta, kidnapping six Russian sailors and an Estonian in the assault, the firm said Wednesday.

Paris-based Bourbon SA offered only a tersely worded statement on its website about the attack Monday near the Niger Delta, where the company works closely with oil companies like Chinese-owned Addax Petroleum. Gunmen apparently attacked the Bourbon Liberty 249 and seized the sailors before escaping, the company said.

Another nine sailors onboard the vessel sailed safely away to the company's port in Onne in Nigeria's Rivers state, the company said.

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"The emergency unit set up immediately by Bourbon has been set up to aim at their rapid liberation under the safest security conditions," the company said in its statement.

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