Wrongfully emptied or stripped of anything of value "the robbers left the looted train" - pillaged, plundered, ransacked
Verb: lootloot
Take illegally; of intellectual property - plunder
Steal goods; take as spoils "During the earthquake people looted the stores that were deserted by their owners" - plunder, despoil, reave [archaic], strip, rifle, ransack, pillage, foray