The sex crimes investigation involving four Vanderbilt University football players is nearing an end, USA Today reported.

Two weeks ago, the four players dismissed from the school for a violation of team rules were identified, but it is still not known if they were the perpetrators. The Metro Police Sex Crimes Unit has been investigating the alleged incident for nearly a month.

The investigation even led two officers to the west coast to track down a possible lead. The officers have returned since and the investigation appears to be nearing an end.

"Among those leads were matters on the West Coast," police spokesman Don Aaron said. "Our detectives were there last week, they have now returned and the investigation from the police department's standpoint is nearing completion. But there is no definitive time frame."

Four unidentified players were suspended in early July for a violation of team rules shortly after the investigation began. Two weeks ago, those players were identified to be Cory Lamont Batey, 19, from Nashville; Brandon Eric Banks, 19, from Maryland; JaBorian "Tip" McKenzie, 18, from Mississippi; and Brandon Vandenburg, 20, from California.

There is still no indication from the school or from police that these are the men tied to the investigation and no charges have been filed. Aaron declined to comment on whether or not any charges would were on the way.

"This investigation has been active since the very day the police department learned of it," Aaron said. "I am not going to pin myself down on a time frame except to say the analysis of evidence gave us new leads that had to be pursued."

Aaron would not say why the investigators flew to the west coast.

The Metro Police's Sex Crimes Unit became involved in the investigation from the start when a female Vanderbilt student claimed told the school police she was sexually assaulted in a campus dorm room.

Police have stated that forensics and DNA will play a role in their probe and that evidence has been collected and sent to the lab for testing.

"We continue to consult regularly with the district attorney's office about the matter, and they have been kept fully apprised of our progress," Aaron said. "But it does appear the investigation is nearing a conclusion."