Authorities in northeastern Kansas are investigating the theft of more than $30,000 worth of heavy farm equipment.

The Pottawatomie County sheriff’s office says a John Deere tractor with a front loader, an 18-foot flatbed trailer and a grass seeder disappeared from outside an equipment auction business in Manhattan.

The owner says he saw the machinery parked at the business on Sunday afternoon, then noticed them missing on Monday.

Pottawatomie County Sheriff Greg Riat says it appears that someone hooked the trailer to a vehicle and drove away with the machinery.