MADISON, Wis. (AP) — Authorities say a ground search has turned up nothing useful as investigators look for a 13-year-old Wisconsin girl who vanished after her parents were found dead.

Deputies discovered Jayme Closs’ parents shot to death in their home in rural Barron early Monday. The girl was nowhere to be found . Investigators say she’s in danger and isn’t a suspect.

Barron County Sheriff Chris Fitzgerald says the ground search won’t resume Friday. The search began Thursday with 100 volunteers combing fields and ditches, but Fitzgerald says they found nothing of evidentiary value.

Fitzgerald says his office hasn’t received any tips that justify continuing the ground search.

His office also asked that anyone who’d recently spent time with family or had a misunderstanding with them, or knew someone who did, to call authorities.