CASPER, Wyo. (AP) — A Riverton woman has been arrested after Fremont County Sheriff's deputies say she made more than 625 prank 911 calls over the weekend.

The Associated Press reports investigators tracked the calls to the prepaid cellphone of a 19-year-old woman, who was arrested on suspicion of misuse of 911 and interference with a peace officer.

Deputies aren't sure what the woman's motive was.