Kiely Rodni was last seen around 12:30 a.m. on Saturday at a party near a Truckee, California, campground.
The Placer County Sheriff's Office is treating Rodni's disappearance as a possible abduction.
Rodni's mother filmed a tearful video Sunday, asking the public for help locating her daughter.
Police in Northern California believe a 16-year-old girl may have been abducted after she went missing at a party in the early hours of Saturday morning.
Kiely Rodni was last seen around 12:30 a.m. on Saturday at a party involving about 100 "juveniles" and young adults near the Prosser Family Campground in Truckee, California, according to a press release from the Placer County Sheriff's Office.
Rodni's vehicle, a silver 2013 Honda CRV with the California license plate "8YUR127," is also missing, which led police to start investigating her disappearance as a possible abduction, KCRA reported.
Rodni's friend Sami Smith told CBS Sacramento that she was with Rodni for most of the party and said that Rodni was planning on spending the night at the campground.
"I know that she wasn't in the right mindset or state to drive. And if she were to have driven, she wouldn't have made it far," Smith told CBS Sacramento. "So my concern is that somebody might have offered to drive her home and then didn't take her home."
On Sunday night, the Placer County Sheriff's Office posted a video of Rodni's mother making an impassioned plea to the public for help locating her daughter.
"We just want her home. We're so scared, and we miss her so much, and we love her so much," Lindsey Rodni-Nieman said in the video through tears.
The Placer County Sheriff's Office did not immediately return Insider's request for an update on the case Monday morning.
Rodni is described as a Caucasian female who is 5'7" tall, 115 pounds, with blonde hair and hazel eyes. She has numerous piercings and jewelry, including a nose ring, the sheriff's office said. She was last seen wearing green Dickie's pants and a black tank top.
Anyone with information on Rodni's whereabouts should call the sheriff's office at 1-530-886-5375. Anonymous tips can be texted or called in to Secret Witness at 775-322-4900, or at their website.
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