A 15-year-old girl was gang-raped by four men in Lucknow on Wednesday. The horrid incident took place when the girl went missing from her home in the evening and was later found in the hospital at the trauma centre. As per the victim's mother, the minor disappeared in the evening and was traced back, early morning next day. The minor is yet to identify the main accused however one of the partners in crime has been arrested. "She knew the accused before the incident and willingly went with him, the accused later changed his mind and committed the crime along with his partners," said the police official. Further investigation is underway.