Its a 777-200ER with RR Trent engines and should have no problem with an overweight landing except for needing an inspection following the landing - unless the problem was more than an engine. cthruit's response is the most logical I've read - forgot to quit dumping when they came back for a landing after having dumped fuel in the assigned area. They did manage to dump the fuel on several schools, possibly because at that time of day students were out playing while workers were - well, working, or out commuting. OMG the potential for disaster sucking jet fuel into the engine compartment and onto a hot engine. But then again knowing jet fuel is not all that volatile, the reason it was still in droplets as it dumped on the people below, such a happening extremely remote.