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sioux falls - Local authorities have charged a Sioux Falls man with having child pornography on his phone.According to court papers, a caretaker visited Aaron C. Knutson, 47, at his apartment in the 3000 block of East 26th Street on Friday, August 11. While inside, she heard Knutson's phone ring and had unlocked the phone to see who had called. She told police that there were three images that she believed were child pornography.The caretaker called police, who visited Knutson and took his phone as evidence. A detective used a search warrant to search the phone and allegedly found child pornography on it. On August 18, Minnehaha County Sheriff's Office deputies arrested Knutson on three counts of child pornography.Knutson was released on bond.