Japan today released the 14 crew of a Chinese fishing trawler involved in a collision with two Japanese coastguard vessels in disputed waters last week. But it kept captain of the vessel in detention. The incident has sparked a diplomatic row between the Asian powers, with China calling off planned talks over oil and gas fields in a contested area of the East China Sea and summoning Tokyo's ambassador four times to protest. Japan's top government spokesman Yoshito Sengoku said, questioning of the crew have been completed and prosecutors have also finished collecting evidence from the ship. So, he said, there was no reason to keep them in Japan. The fishing boat's captain was arrested on Wednesday on suspicion of obstructing officers on duty. This charge carries up to three years' prison. A court has since approved his continued detention.