An Iowa father upset about sex education curriculum at his child’s school caused several schools to be placed on lock-down after sending a threatening email to school officials, KWWL reports.

Bruce “Deano” Divers, Jr. now faces charges in relation to the email, that said he plans to “retaliate” for sex ed classes being taught to fourth graders in the city of Decorah. When reached by KWWL, Divers said he sent the email to a teacher.

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The email read, in part, “Decorah schools spiritually declared war against my house today. When I retaliate Monday morning…” according to the station.

Decorah Community School District Superintendent Mike Haluska said Divers could have signed a waiver at the beginning of the school year exempting his child from participating in the classes.

“Interestingly enough, we have paper work available at the beginning of the school year for anyone who wishes to have their children exempted from any conversations that have to do with that type of subject matter,” Haluska told KWWL.

Divers was arrested Monday, on charges of harassment. Officials say he threatened two teachers on Facebook.

Classes were held as usual on Monday but about a quarter of the districts 1,700 children were absent, Haluska told the station.

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Watch the report, as posted by KWWL, here:

KWWL – Eastern Iowa Breaking News, Weather, Closings