Can't delete group instance? I have downloaded a Blender file, and the model is visible twice. 
I would like to have only 1 of them. But no matter what I try, I am unable to remove just one model. 

I have uploaded the Blender file here: 
http://www.pasteall.org/blend/38503

Could anybody tell me what is happening in this file? 
I think the maker of this file created a linked clone or so. 
Is this true?

Can anybody tell me how to have just 1 model?

Thank you very much!
Model which is called Chainsaw is a group instance. Select this model in Viewport or Outliner and click delete. You can add again this group by Shift+A => Group Instances => Chainsaw.