Authorities say a reward for information leading to the safe recovery of a missing 9-year-old Tennessee girl has increased to $12,500.

The Tennessee Bureau of Investigation said law enforcement officials continued to search Saturday for 9-year-old Carlie Marie Trent of Rogersville in the eastern part of the state. The bureau says it is working through more than 100 tips it has received since issuing an Amber Alert on Thursday, but there have been no credible sightings so far.

Authorities say Carlie was signed out of school under false pretenses Wednesday by her non-custodial uncle, 57-year-old Gary Simpson. The bureau says they may be in an "isolated area" such as a campground or state park.

Carlie's pediatrician is offering a $10,000 reward. The U.S. Marshals Service is offering a $2,500 reward.