Last month, someone cut through a fence at the Harris Ranch property along Interstate 5 and Highway 145.
Once inside, the suspects set up several timed devices beneath tractor trailer rigs that detonated and destroyed 14 rigs.
While no one was injured, damage is estimated in excess of $2 million.
The North American Animal Liberation Group later posted an anonymous claim of responsibility on several websites, but the offenders themselves have not been identified.
Anyone with information is asked to call the Fresno County Sheriff's Office.
