Pacific Ocean links strait to the South China Sea and strait . The IFC warned tanker crews to be on the lookout for smaller vehicles -- including dinghies , sampans and speedboats -- which have been used to launch successful attacks on tankers in the past . Estimated only 1.7 miles of oil are transported through the strait Thursday . At its narrowest point the strait is only 1.7 miles wide , making it vulnerable to attack .
Pacific Ocean links strait to the South China Sea and strait . Estimated only 1.7 miles of oil are transported through the strait Thursday . At its narrowest point the strait is only 1.7 miles wide , making it vulnerable to attack .