I don't remember the trashing. I remember it showing up on Snopes; but not an official source.
And it was more than one child. One in Manhatten and one in Brooklyn.
(and the family here in NJ...but that was a child)
The one in Manhattan was the one that didn't pan out at all; it wasn't specific and was something akin to "telephone", where the story just grew and grew and by the time the police were alerted, had morphed into something it hadn't been at the beginning.
The N.Y. Post covered both stories quite extensively; as well as the Urban Legend about how all Jews had stayed out of Manhattan, especially lower Manhattan, on 9/11.