text:  Malaysia has intercepted a large oil tanker but collided with another ship on Friday and then fled the scene, turning off its tracking system. The vessel, the Series 1, collided with the Singapore-flagged Hafnia Nile, which was carrying naptha, a highly flammable type of petroleum. Both ships caught fire. Reports have suggested the Series 1 could be part of a so-called dark fleet carrying oil from countries under sanctions.