The Malaysian Maritime Enforcement Agency (MMEA) Tuesday detained 21 Vietnamese fishermen and seized two deep sea fishing vessels near Malong oil rig, about 90 nautical miles off Kuantan. Kuantan MMEA chief Capt Abdul Aziz Idrus said a team led by Lieut Hafizi Mohd Rafiq was on patrol duty aboard KM Lang at 11am when it spotted a foreign vessel fishing in the area.