VIENNA (AP) -- Austrian police are seeking witnesses to an unusual theft -- of huge amounts of grass, mowed secretly from a farmer's field. A police statement says the theft occurred around Liebenfels, a village about 120 miles southwest of Vienna. It says a farmer reported his field mowed and the grass gone on Monday. Police say the grass went missing sometime in the last three weeks but the farmer noticed it only Monday because the field is at some distance from the rest of his property. They say the owner estimates its worth more than $4,000 as fodder.