Prosecutors raided offices of the operator of a sunken ferry and its affiliates Wednesday as part of a widening probe into the cause of the disaster. Investigators of the Incheon District Prosecutors' Office raided Cheonghaejin Marine Co., the Sewol's operator based in the coastal city, just west of Seoul, as well as some 20 offices of its affiliates and a religious group in Seoul believed to be related to the owner family