On 26 March 2010, the 1,500-ton ROKS "Cheonan" with a crew of 104, sank off Baengnyeong Island in the Yellow Sea. Seoul said there was an explosion at the stern, and was investigating whether a torpedo attack was the cause. Out of 104 sailors, 46 died and 58 were rescued. South Korean President Lee Myung-bak convened an emergency meeting of security officials and ordered the military to focus on rescuing the sailors. On 20 May 2010, a team of international researchers published results claiming that the sinking had been caused by a North Korean torpedo; North Korea rejected the findings. South Korea agreed with the findings from the research group and President Lee Myung-bak declared afterwards that Seoul would cut all trade with North Korea as part of measures primarily aimed at striking back at North Korea diplomatically and financially. North Korea denied all such allegations and responded by severing ties between the countries and announced it abrogated the previous non-aggression agreement.