SEOUL (Xinhua): Two people were killed and several others wounded as a cargo trailer's wheel came off and hit a tourist bus on a South Korean highway, Yonhap news agency said Sunday. A back wheel was detached from the trailer driving toward the capital Seoul on an expressway in Gyeonggi province at about 4:09pm local time (0709 GMT). The detached tire ran over the median strip and broke through the windshield of the tourist bus, which was driving on the opposite lane. A bus driver and a passenger sitting diagonally behind the driver were killed after being hit by the tire. The police were investigating the trailer driver in his 60s to determine the cause of the accident.