The iron ore-laden ship that sank off Paradip coast 12 days ago has started discharging oil in small quantities, triggering concern among the environmentalists in the state. Mongolian vessel MV Black Rose, carrying 24,000 tonnes of iron ore, sank 3 km off Paradip on September 10 soon after it anchored off the port. Due to a technical snag, the vessel tilted and sank.