"Cheonan", a South Korean patrol vessel with 104 people aboard, sank after an unexplained explosion tore through its hull while conducting a normal mission in the vicinity of Baengnyeong Island at 9:22 p.m. on March 26, 2010. An investigation conducted by an international team of experts from South Korea, the United States, the United Kingdom, Canada, Australia and Sweden concluded that "Cheonan" was sunk by a torpedo launched by a North Korean Yeono class miniature submarine. This incident caused rising tension and antagonism between North and South Korea.