(AP) — Nearly 50 gravestones have been pushed over and some damaged at a south-central Nebraska cemetery.

Hamilton County Sheriff Kirk Handrup said his investigators had some leads, but no arrests have been reported. A man who lives near Farmers’ Valley Cemetery discovered the damage Tuesday morning.

The cemetery was established in 1876 along the banks of the Big Blue River south-southwest of Henderson.

The cemetery association is offering a $1,000 reward to help solve the case.