(AP) — Officers are still searching for an inmate who escaped from the Thurston County Jail in the northeast Nebraska city of Pender.

A sheriff’s office worker said 39-year-old Mark Kuehn was still on the loose Thursday morning. Jailers discovered that he was missing Wednesday morning. How he got out hasn’t been disclosed.

The jail is just blocks from Pender schools, so they were locked down. Schools in nearby Wayne were locked down, too.

Kuehn has been in jail since his conviction on two counts of theft. He’s also a sex offender who was convicted in Stanton County.