The rate of indictments on those suspected of sexual crimes against children plunged in the past five years despite an increase in such cases, a report said Tuesday, leading to a call for sterner action. A total of 4,656 people were investigated on suspicion of child molesting last year, almost double the 2005 number of 2,314, according to a Justice Ministry report submitted to Grand National Party Lawmaker Jeong Kab-yoon during a parliamentary audit.