Somali pirates on Tuesday seized a tugboat operated by the French oil company Total and a Turkish cargo ship, as the UN anti-crime agency called for a special maritime police force for the insecure Gulf of Aden coastline. Somali pirates have seized over 40 vessels off Somalia's 3,000-kilometer coastline this year. Before the latest seizures, maritime officials say 14 remained in pirate hands - including a Saudi oil tanker carrying $100 million in crude and a Ukrainian ship loaded with tanks and heavy weapons. Also held are a total of more than 250 crew members. Antonio Maria Costa, executive director of the Vienna-based UN Office on Drugs and Crime on Tuesday urged law enforcement officers to deploy on warships as "ship riders" to seize pirates and try them in the arresting officer's home country.