[h=1]Nigeria gunmen storm oil ship - two dead, four kidnapped[/h] Gunmen in Nigeria have stormed an oil industry vessel off the coast, killing two Nigerian navy sailors and kidnapping four foreigners. Nigeria's navy has joined the search for the gunmen off the Niger Delta. It is not yet clear which country or countries the foreigners are from. In 2009 an amnesty for thousands of militants brought peace to the Niger Delta, which had been plagued by violence. The heavily polluted delta is Nigeria's main oil-producing region. The ship that was attacked belongs to Sea Trucks Group, based in the Netherlands.