A few years back we picked up a crap load of ice on a 767/300, landing at LHR, { the horizontal stab is not de iced} we began to shed it just inside the OM, a huge hunk departed the wiper arm at about a thousand AGL, after my morning walk I was about to climb into the sack when the phone rang, it was some bod from the airport asking if we were aware that we had dumped some fairly big chunks of ice on some streets/roofs and a parking lot. Of course I denied any knowlege of this event, the last thing one needs is the press phoning all day when one is due out at zero dark thirty the next day.Over this side of the pond there have been many cases of "Blue Water" bombs falling from the sky, has anyone ever been injured/killed by such events?