the supreme prosecutor's office arrested tsunehiko maeda of the osaka district office on suspicion of tampering with data while investigating a ministry official suspected of fraud. the supreme prosecutor's office carried out a search of maeda's residence for more than two hours on tuesday evening. the sources say maeda's colleague pointed out that the data may have been intentionally falsified. the sources say the quarrel was reported to higher-ranking officials of the district prosecutor's office. the supreme prosecutor's office will question the officials and colleagues who worked with maeda at the osaka prosecutor's office at that time. it's also trying to find maeda's motive for tampering with the evidence. >>> more exchange events planned between japan and china have been suspended over the recent collision between a chinese fishing boat and japan coast guard patrol vessels. a chinese trawler captain was arrested after the incident near the senkaku islands off okinawa in japanese territorial waters. the islands are also claimed by china and taiwan. a japanese court decided on su