A group of eight women who were forced to serve as sex slaves for Japanese troops during World War II are suing a Japanese rock band who called the so-called "comfort women" prostitutes.
They filed a defamation complaint against the band Scramble with the Seoul Central Prosecutors Office on Monday.
A shelter for former sex slaves in Gwangju received on Thursday a parcel with a CD and printout that read, in polite translation, "Kill the elderly prostitutes."
In January, Scramble also posted on YouTube a music video insulting Koreans and Korea's national flag.
Lawyer Kim Kang-won said it is acknowledged by the international community that the comfort women were victims of Japanese militarism. "We're suing the band for their anachronistic behavior," he added.