Way to delete all collaborators from list at once, not one by one

Summary

Someone added all taleo users as collaborators by mistake. way to undo?

Content

Someone added all available taleo users as collaborators to his req. He must have hit Select All. The list is enormous, literally hundreds. Does anyone know if there is a way to delete them all without having to go through the list one by one? I did not see a button but I may have missed it. The only other option I could think of was to start with a fresh req. Not even sure if duplicating the req will allow me to do this.