DELPHI, Ind. (AP) — Authorities say the reward in the killings of two northern Indiana teenage girls reaches over $100,000.

State Police say donations from the public and businesses had boosted to $100,360 the reward for information leading to an arrest or arrests in the killings of 14-year-old Liberty German and 13-year-old Abigail Williams.

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Police also said Monday they’ve received about 8,800 tips in the murders. They received 500 additional tips overnight, totalling over 9,300.

The Delphi girls’ bodies were found Feb. 14 in a wooded area near the city about 60 miles northwest of Indianapolis, a day after they vanished while hiking.

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Carroll County Sheriff Tobe Leazenby says investigators remain confident they’ll eventually make an arrest.

Authorities have released two grainy photographs of a man and audio of a male saying “down the hill.” That evidence came from German’s cellphone.

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