The two Chinese, two Indians and one Polish national were seized across the southern Niger Delta, said Brig. Gen. Lawrence Ngubane, a military commander in the region. He had said earlier that three Chinese were taken in one attack, but later said only two had been kidnapped.

On Thursday, a leader of the militant group behind attacks on Nigeria's oil industry walked free from prison after a judge granted him bail a breakthrough in the crisis roiling Africa's oil giant and global petroleum markets.

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