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SIOUX CENTER, Iowa (AP) — A former northwest Iowa fifth-grade teacher charged with multiple acts of sex abuse and released on bond last November is back behind bars on new charges.

Sioux City television station KTIV reports that 36-year old Curtis Van Dam was arrested Friday morning at his Sioux Center home on a federal warrant charging him with sexual exploitation of a child and possession of child pornography.

Van Dam has already pleaded not guilty to 146 Iowa counts, including 73 counts of second-degree sexual abuse.

His trial on the state charges is set to for March 6.

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Police say the charges stem from incidents involving numerous children over four years and that the crimes occurred at various locations, including Sioux Center Christian School, where Van Dam worked.

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Information from: KTIV-TV, http://www.ktiv.com