TULSA â€"  Tulsa police are searching for clues after a 17-year-old girl was gunned down in a car outside her home by a possible assault rifle, Fox 23 reports.

Kayla Ferrante, who had graduated high school a year early the day before, was being driven home by her boyfriend Saturday when a bullet pierced through the license plate of the car, tore through the trunk and hit the teen in the back. The teen was shot around the corner from her parent's house and later died at a hospital.

Detectives say the bullet used was a high-powered round, possibly from an assault rifle.

“Those things will travel until they hit something really solid,” Sergeant David Walker told Fox 23.  “There could be damage farther down that we haven't even seen yet.”

Ferrante, who was driving home to make her curfew, was planning on attending college to help special needs children after graduating high school a year early, NewsOK.com reports.

“She had found her calling in life, which was to work with children with disabilities, and planned to volunteer at Little Lighthouse this summer, while also taking her first college course,” her family said in a statement obtained by NewsOK.com. 

Investigators told NewsOK.com they "don't even know why" Ferrante was killed, and urged anyone with information on the shooting to come forward.

"Nothing is off the table," Sgt. Walker told Fox 23. "It could be these people were targeted, it could be the car was targeted, it could be a total random act, it could be a mis-identification of the car."

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