Young tree blighted by broken branch

Does anyone know anything about the damage inflicted on this tree on the Warrington Crescent side of the Garden yesterday afternoon? It comes amidst the odd report of children climbing trees which is strictly forbidden under the Formosa Rules -- apart from anything else young trees like this one are simply not equal to bearing a person's weight. Much time (by Gravitas) & much money (by us!) is spent on making the Garden into the special place that it is & it's simply not fair for a small number of selfish people to risk ruining it for the rest.