Authorities say they have identified additional victims and arrested a sixth adult in a child sex abuse case in western Missouri.

The Missouri State Highway Patrol says the suspect arrested Thursday night is a 55-year-old Kansas City man not related to the other five defendants. He is described as an "associate" of the others, who include a 77-year-old man and his four adult sons.

The patrol says the man was arrested without incident in Jackson County on suspicion of raping a child less than 14 years old. He has been taken to a jail in neighboring Lafayette County Jail where the other defendants also are being held.

No information was released on the additional victims.