Authorities have found a body in a Northern California reservoir and believe it is 16-year-old Kiely Rodni’s. The teen went missing weeks ago after attending a large party at a Sierra Nevada campground.

Nevada County Sheriff Shannan Moon told a press conference that the body had not been identified yet but “we believe it is our missing person.”

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Volunteer divers with a sonar-equipped group called Adventures with Purpose said they found Kiely Rodni of Truckee on Sunday inside her car, which they said came to rest upside down under about 14 feet (4.2 meters) of water in Prosser Reservoir, about 55 feet (16.7 meters) offshore.

Adventures with Purpose search members Doug Bishop and Nick Rinn briefly described the search in a Facebook livestream Monday morning. Rinn said they were limited in the scope of details they could release. The Oregon-based group says it has solved more than 20 missing persons cases using sonar and search-and-rescue techniques for its dive team.

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Bishop said they put two sonar boats in the water at 10:40 a.m. and by 11:15 a.m. Rinn detected an object with sonar technology. Bishop said he was able to confirm it was a vehicle. Rinn put on his gear and conducted the dive to examine the car.

“Once we confirmed it was indeed Kiely’s vehicle we immediately notified family, law enforcement and (the teen’s) dad and grandpa were on scene within minutes,” Bishop said.

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Who was Kiely Rodni?

Kiely Rodni was a 16-year-old music student and entrepreneur from Truckee, California. She was last seen on August 6 near the Prosser Family Campground in Truckee, attending a party with hundreds of young people, authorities have said. The campground is at the reservoir in the Sierra Nevada, about 165 miles (266 kilometers) northeast of San Francisco.

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Her friend, Sami Smith was at the party with her and said Rodni had been planning to spend the night at the campground.

According to People, her boyfriend’s name is Jagger Westfall. During the investigation, police asked some questions to Westfall. As per Fox 40, Westfall said that “I don’t know where she is”.

Her mother’s name is Lindsey Rodni-Nieman.