Gunmen in speedboats kidnapped six people from an oil vessel off Nigeria's coast at dawn Friday, the second attack on petroleum workers this week, officials said.
The Polish, Filipino and Nigerian workers were seized from the Mystras, some 50 miles offshore, Italian energy giant Eni SpA said on its Web site. Another Nigerian worker was reported to have been wounded in the leg, the statement said.
The Mystras, used for production, storage and offloading crude oil, is capable of producing 80,000 barrels of oil per day. An Eni spokeswoman refused further comment.
Militants have kidnapped more than 150 foreigners this year to press their demands for local control of oil revenues. The attacks since late 2005 have cut Nigeria's regular output by about 20 percent, helping send crude prices toward all-time highs.
Locals have for years demanded a greater share of the wealth in Africa's largest crude producer, and the region remains desperately poor despite its great natural bounty.
The government of President Umaru Yar'Adua has stepped up efforts to maintain calm in the Niger Delta, and violence has waned since he took power May 29. But the latest attacks could set back plans for formal talks between the government and the main armed groups.
A militant group, the Movement for the Emancipation of the Niger Delta, claimed responsibility for Friday's attack in an e-mail to The Associated Press.
Also this week, MEND said it was responsible for an attack Sunday on an offshore oil field operated by Royal Dutch Shell. Militants kidnapped seven workers — Nigerian, British, Croatian and South African — but released them after two days.
The group, which threatened last month to resume attacks after one of its leaders was arrested in Angola, vowed to continue the violence.
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