Gunmen seize three Asian company managers-police

PORT HARCOURT, Nigeria, Jun 1 (Reuters) Gunmen used dynamite and heavy machineguns to kidnap at least three senior managers of Indonesian chemical company Indorama in a pre-dawn raid on their residential estate in Nigeria's southern oil-producing delta, police said.

The latest hostages added to a tally of 20 foreign workers already being held by various armed groups in the chaotic Niger delta, which is home to Africa's largest oil industry.

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