EL RENO, Oklahoma - An investigator who interviewed a Yukon couple accused of beating, burning and cutting their three adopted children took the stand Thursday.

Sonja and John Kluth are accused of torturing the children, locking them in a shelter and dog crates, and feeding them pet food. An investigator took the stand Thursday and said Sonja didn't want them to contact her biological children because she was estranged from them. The investigator said she admitted she was sometimes "too aggressive" with her punishments for the children.

Both of the Kluths are charged with six counts of child neglect and child endangerment.