Its both. They were there allegedly serving a warrant. That alone should have had awareness up pretty high and depending on the warrant type, SWAT or at least a team trained with bunkers should have been there. That also being said, with them being apparently more lax in this situation leads me to believe that it was a low level warrant on a farm where they normally don't have problems. Also, the ease at which an ambush can be set up is extremely alarming. Things like this lead to more militarized police which ironically is one of the things protested the loudest.