Police say two witnesses have come forward in the case of an alleged teen gang rape at a B.C. rave, but no charges have been laid because of a lack of hard evidence.

As photos of the incident continue to spread on Facebook, there also appears to be confusion about how many males actually took part in the Sept. 10 assault at a farm in Pitt Meadows.

"At this point, we are still trying to determine how many males were involved in this terrible sexual assault," said RCMP Sgt. Peter Thiessen at a press conference Thursday afternoon.

"We feel strongly that there's been more than one individual involved in the actual sexual assault."

Deflecting criticism that the investigation hasn't moved quickly enough, police said that allegations of "gang rape" continue to be applicable, despite some concern that the term was used prematurely.

"It was not premature, because that's the information that we had," Thiessen said. "Until we can prove otherwise, we're going on that premise."

Police say that between five and seven males may have watched the assault occur. However, they have declined to definitively say how many males took part in the actual assault.

"The only number that we publicly commented on was on the number of witnesses," he said.

Thiessen said that more witnesses need to come forward to help in the investigation.

"Do we wish we could be proceeding faster? Absolutely," said Thiessen.

Police now believe that the 16-year-old victim was under the influence of GHB, which is known as the date rape drug. Still, more evidence needs to be gathered.

"We don't have enough information to date to make a definitive statement about the victim's condition during the alleged assault," Thiessen said, adding that police believe the victim did not ingest any drugs willingly.

Meanwhile, the teenage victim has returned to school, where she is getting the support of staff and students, her family said in a statement.

"This incident has been devastating to our family and close friends," said the family statement, which was read publicly by Thiessen.

"There are a lot of kids out there supporting her, and that's making a big difference."

However, the ongoing spread of photos which were taken during the incident and spread on Facebook continue to re-victimize the girl.

"She has no privacy and the wound is being continuously opened," the family said.