Three Elk Grove teens are in juvenile hall and charged with knocking a younger boy unconscious and robbing him of his cell phone and other valuables.  

The Sacramento Bee reports that the victim and some friends saw what they thought was a fight and went to investigate.  

The fight turned out to be just kids fooling around.  

When the victim and his friends went to leave, though, they were jumped.  

A 14-year-old was kicked and punched until he was unconscious.  

Police located the suspects at an apartment and the phone was recovered.