Reuters reported that South Korea will ban single-hulled tankers from traveling in its waters by 2011, earlier than the international regulation that calls for a ban from 2015, Seoul's maritime ministry said. A single-hulled tanker was involved in South Korea's worst oil spill last month, leaking around 10,500 tons of crude oil after a sea-bound crane mounted on a barge punched holes in the tanker's hull. As of January, 43 per cent of the crude imported into South Korea was carried by single-hulled tankers. This is the first time the ministry has officially set a time frame for banning the tankers. The ministry had previously said it was aiming to phase out single-hulled tankers as soon as 2010.