A Tecumseh High School student was arrested over the weekend after allegedly posting threatening images online that suggested a plan to harm the school district. The arrest prompted district officials to close all district schools Monday and Tuesday as a precautionary measure.

The investigation began Saturday morning when the FBI contacted the Pottawattamie County Sheriff's Office about a concerning Facebook post made last month.

"Saturday morning, around 9:30 a.m., the FBI contacted the Pottawattamie County Sheriff's Office with some social media posts they had received," said Tecumseh Police Chief J.R. Kidney.

According to investigators, the posts included photos taken inside the high school bathroom showing the student holding a pistol. Within hours, officers obtained a search warran

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