Student: You did that? Koreans have questioned why police did not step in sooner after the victim filed her first complaint.
After the attack, one of the girls sent a photo to another student, bragging about what she had done.
All four of the girls have been taken into custody for the horrific attack.
Student: Was it just you two? Student: What did you do? Parents, you can easily block access to this site.
The unconscious victim lay beaten and bloody until discovered by a woman walking by.
Three of the attackers are 14 years old, while one is still 13 years old.