A SCHOOLGIRL who claimed she was sexually assaulted at knifepoint has admitted this morning she made the report up.

Police have stated the alleged incident at Edithvale beach on Tuesday evening is now being treated as a false report.

"Information was provided to detectives this morning which has revealed that no offence occurred," a Victoria Police spokeswoman said.

"Police would like to reassure the community that there are no safety concerns."

Victoria Police said charges will not be laid against the 18-year-old Aspendale year 12 student.

"Detectives have concerns about the welfare of the young woman and are assisting her and her family," the spokeswoman said.

"Victoria Police won’t be laying charges in relation to the report as we do not believe this is in the best interests of the young woman involved."

Originally published as Teen admits sex attack story was false