Gunmen in speedboats have kidnapped at least six workers from an oil facility off the coast of southern Nigeria.

The Italian oil company Eni says armed men seized the workers early Friday after boarding the Mystras, a ship with capacities for pumping, storing and loading crude oil.

Eni says the kidnapped workers are of Polish, Philippine and Nigerian nationality. It says one other Nigerian is reported to have suffered a leg injury.

Nigeria's oil-rich Niger Delta region has been plagued by attacks on foreign oil facilities and their employees over the past two years.

More than 200 foreign workers have been abducted, either by gangs seeking ransom or by militants who want local villages to get more of the region's oil wealth. Most of the workers have been released unharmed.

Some information for this report was provided by AFP, AP and Reuters.