MINTHILL, N.C. -- Mint Hill authorities and the FBI ended their search at the pond near the missing 16-year-old Kayla Campbell's home on Tuesday afternoon.

Authorities resumed their search of the pond on Tuesday morning where the missing teen s bicycle, helmet and cell phone were found on Monday.

A seven to eight square mile radius between Bartlett, Glenn Croft and the Summerwood subdivisions, near Kayla's home, has been thoroughly searched, police say, and no new evidence was found to assist investigators.

It means a lot because we feel like they are doing everything they can, they are looking everywhere they can to find her, said Stephanie Campbell, the teen's mother.

Now, officials say they will continue to follow up on the numerous tips that came in overnight, and search Kayla's phone records in an attempt to turn up new leads or any new information that may lead to her whereabouts.

Early Tuesday afternoon, the Mint Hill Police Department notified the National Center for Missing and Exploited Children, and a Silver Alert was issued statewide for Kayla. Authorities added that although the Silver Alert initially indicated Kayla suffered from Dementia, that report is absolutely false.

Kayla's parents told NBCCharlotte that she suffers from depression. When asked if they were worried if Kayla may hurt herself, Mint Hill Police Lt. John Rowell said, We really don't have one main concern; our main concern is to find her safe again, we're leaving all other possibilities open.

Police and fire units located items belonging to a missing Mint Hill teen in a pond near Kayla's home on Monday afternoon, but further details are hard to come by.

The search took place on Pumpkin Way Drive, just a short distance east of Interstate 485, near the interchange with N.C. 51 and south of Albemarle Road.

Police say they found a bike, cell phone and a bike hat in the pond belonging to Campbell.

Officials released few other details, however, and it's still unclear if she was abducted.

The girl's father says his daughter was last seen at the family's home around 2:30 Sunday afternoon.

Kayla is described as 5-foot-6, weighing 115 pounds, with long brown hair and blue eyes.

According to radio reports, a fire department dive team was called to the pond around 11 a.m. The team arrived about 11:30 a.m. and was in the water a short time later. Other units were using boats to search.

Five fire trucks, a number of Mint Hill police cars and a Medic van were parked near the pond.

Campbell lives about a quarter-mile from the search scene.

Around 6 Sunday evening, police responded to a residence in the 9000 block of Dartmoor Place in reference to a teen girl who had not returned home.

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