The coast guard searched Monday the office of the operator of a tour boat that sank off Hokkaido with 26 people aboard over a week ago as well as the house of its president, suspecting the tragedy was caused by gross professional negligence.The 1st Regional Coast Guard Headquarters will look into the documents it collected from Shiretoko Yuransen in Shari, Hokkaido, and the company's president, Seiichi Katsurada, in an attempt to speed up the process of understanding the incident to build a case against the operator.The boat left port in the town on April 23 despite a bad weather warning, i…READ FULL ARTICLE