Mike Tyson accused of sexual assault

Tyson

BIG BEAR CITY, California (CNN) -- The San Bernardino County Sheriff's office is investigating an allegation of sexual assault made against former heavyweight champion Mike Tyson.

Tyson has not been arrested and no warrant for his arrest has been issued.

According to San Bernardino Sheriff's Detective Mike Folette, a 50-year-old acquaintance of Tyson's reported that she was raped by Tyson July 16 at his rental home in Big Bear City, California -- the mountain resort town where he has been training for an upcoming fight in Copenhagen against unranked Danish heavyweight Brian Nielsen.

An investigation is under way and investigators plan to present their case to the San Bernardino County district attorney by the end of the week. The district attorney will then review the matter to determine if formal charges should be filed.

"In a case like this you depend on your victim, physical evidence and witness statements -- but this case lacked enough probable cause to arrest him initially, based on the allegations alone," Sgt. Frank Gonzales of the San Bernardino Sheriff's Department told CNN. "Investigators are working to search out the facts..."

Folette told CNN that while investigators would like to interview Tyson, his Phoenix-based attorney, Darrow Soll, will not allow him to sit down with police.

Soll could not be reached for comment. However, in a statement provided by Soll to CNN last Friday, a Tyson representative said, "We are aware of the allegation against Mr. Tyson. We feel that the allegation is without merit. We are hopeful that authorities will conduct a thorough and complete investigation, which we expect will clear Mr. Tyson of any wrongdoing. Mr. Tyson will continue to train as scheduled and looks forward to competing in September."

Tyson, 35, was convicted of rape in 1992, and served three years in prison. His first wife, actress Robin Givens, also accused him of abuse.

Tyson, the No. 1 contender in World Boxing Council ratings, faces Nielsen on September 8. No world title is at stake in fight.

The woman who made the accusation sought medical attention at the Bear Valley Community Hospital on July 17, and medical staff notified the sheriff's department. When Folette contacted with the woman, she did not want to pursue the matter.

But on July 24 the victim contacted Folette, seeking to file a report.

--CNN's Dree Declamecy and Carey Bodenheimer contributed to this report.