A day after a South Korean coast guard was stabbed to death by a Chinese fisherman, South Korea president Lee Myung-bak has promised tough measures to crack down illegal Chinese fishing, while a possible visit to China next month may be reconsidered. 　　The incident took place in the Yellow Sea off Koreas Incheon port, where the boat captain stabbed two South Korean coast guards, killing one and injuring another, after being stopped for illegal fishing in the area. 　　Korean authorities say they have enough evidence, including bloodstained clothes, and weapons to press homicide charges against the captain, who has denied stabbing the officers. 　　South Korea's foreign ministry summoned the Chinese ambassador to lodge a strong protest. In response, Chinese foreign ministry said that Beijing would clarify details and work with South Korea to solve the dispute. 　　However, the incident angered Korean public, as more than 100 protesters demonstrated outside the Chinese embassy yesterday to express their outrage. The sea inside South Korea's exclusive economic zone is rich in crabs and anchovies. About 430 Chinese ships have been seized for illegal fishing in the Yellow Sea so far this year.