Don't know but I don't think that in general there is any duty to save another person unless that person is under an obligation. For example, if you see someone about to get hit on a road, you aren't under an obligation to save that person, even if it seems relatively easy. However, if you put that person in a position of danger, for example, you knock him out with a punch and he is groggy and in the middle of the road, you may have a duty to pull that person off the road so he doesn't get killed.
I think that there may be a duty for public officials but it also depends upon what knowledge is versus speculation or possibility. No one can predict what will or will not happen.