An argument between a boyfriend and girlfriend resulted in the assault of an infant on Tuesday.

"The one-year-old was getting a little bit fussy. Boyfriend went over and ended up grabbing the child's arm. He told mom that he thought he had broken the child's arm," Police Spokesman Sam Clemens explained.

"They went to the hospital and the doctor said there was only one way the injury could have happened was by some type of snapping motion and not from a pulling motion. After interviewing the mom and boyfriend---it turns out there was a domestic that happened earlier in the day. The boyfriend was arrested for child abuse and simple assault domestic."

Aside from injuring the child, Clemens says 27-year-old Glen Royal Wanna of Sioux Falls allegedly punched and slapped the mom.

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