LAGOS, Oct 10 (Reuters) - Two oil workers kidnapped by gunmen in Nigeria, a Colombian and a Filipino, were released overnight in good health after 12 days in captivity, security sources said on Wednesday.

The two men were seized by gunmen disguised as soldiers from an oil industry construction yard on Sept. 27 in Port Harcourt, the largest city in Nigeria's southern oil heartland. A Colombian colleague was shot dead during the abduction.

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