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The Nebraska State Patrol is investigating Lancaster County Treasurer Andy Stebbing, but details of the investigation are unknown.

When asked, the State Patrol said Friday the Nebraska Attorney General’s Office is handling the case.

Spokeswoman Suzanne Gage didn’t release details of the investigation, but said in a statement that “We are aware the Nebraska State Patrol is investigating. Our office will review the results of the investigation at its conclusion.”

Gage said the investigation is focused on Stebbing "in a personal capacity" and not the county office. A search warrant was issued Thursday, she said, but has been sealed.

Sources said the State Patrol served the warrant at Stebbing's office Friday.

Stebbing did not answer calls from the Journal Star. His Twitter account, which was active last month, has been deleted.

Employees who work in Stebbing's office declined to comment when reached Friday.

Stebbing, a retired Lancaster County deputy sheriff and former Norfolk police officer, has been Lancaster County Treasurer since 2011 and won re-election in 2014.