"Fifteen oil workers, including their driver, were abducted yesterday by unknown gunmen who hijacked their vehicle on Omoku/Elele road after shooting into the air to scare passersby," Rivers state police spokesman Nnamdi Omoni told AFP.
He said the workers, who were employees of Nestoil, an oil and gas service firm, were on their way to their office in Port Harcourt when they were seized. They are all Nigerian local staff.
Omoni said police was on the trail of the gunmen.
Omoni said police had recovered the bus after it was abandoned by the gunmen.
Kidnappings targeting prominent Nigerians and foreigners, especially in the oil-producing south, was rife in the 2000s until a 2009 government amnesty reduced unrest in the region.
The hostages are usually released after ransom payments.
Last month, two Chinese nationals were seized near the nation's capital Abuja. They were released after 24 hours, but it was not clear if ransom was paid.
Nigeria which normally gets 70 per cent of government revenue from oil, has slipped into a recession, while inflation has surged to 17.1 per cent, its highest in more than a decade.
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