The girl had previously communicated with two of the boys using MSN Messenger .
The girl had previously had arranged to meet them at a Werribee shopping centre ; when she arrived at Werribee Station , the group of twelve walked with her to the Werribee River .
The girl had previously communicated with two of the boys using MSN Messenger , and had arranged to meet them at a Werribee shopping centre ; when she arrived at Werribee Station , the group of twelve walked with her to the Werribee River .