WALHALLA, S.C. -- Six teenagers are charged in connection with the sexual assault of an incapacitated 15-year-old girl at a party last weekend.

The Oconee County Sheriff’s Office is investigating the charges against the six, who include four juveniles.

Investigators said the school resource officer at West-Oak High School received an anonymous tip that a student may have been sexually assaulted at a party Oct. 12 in Seneca.

Sheriff’s investigators say they’re awaiting toxicology tests to determine what caused the girl to be incapacitated.

Investigators say the assault didn’t occur on school grounds or at a school-sponsored event.

Most of the teens are charged with criminal sexual conduct. An 18-year-old is charged with enticing, advising, inviting, ordering and encouraging others to sexually assault the girl.