Barges laden with stolen oil are stationed along the Imo Rivers at Abia state. Nigeria's military said tofay it has seized a ship laden with 5,000 tonnes of stolen oil and 30 barges amid rising cases of crude theft in one of the world's main oil producing regions. In a separate raid conducted at the weekend along Imo River which lies on the border of nearby Rivers and Abia states, the military reported seizing 30 barges with unspecified quantities of crude and illegally refined oil. Thieves often sabotage pipelines in order to gain access to crude, resulting in oil spills. The military said it has arrested dozens of suspected oil thieves in recent months and destroyed some 2,000 illegal make-shift refineries.