Again - what can we say, sympathy, horror, fear ?? Though I just can not express myself coherently on this aweful subject.

On the technical point. The structure of the towers stood the impact as I suspect they were intended to do. But a major fire, fueled with AvKat or JP4, will burn well above the melting point of steel, and the structural destruction of concrete (Confirmed to me by a civil engineer tonight) Once the rebar and frames start to melt the intergral strength goes..

Once the intergral strength of the building is destroyed the weight of the structure above the fire point will collapse the building, and it will collapse upon it self.

As each floor compacts the forces acting upon the frame and structural points will have a different vector from the design stresses and, as we saw on the films, the tower will settle like a concertina.

I pray, oh I pray, that those who were capable of walking got out in time.

It is a tribute to the engineers and architects that the buildings collapsed vertically rather than horizontally.

The thought of both towers tumbling horizontally onto streets and other buildings does not bare thinking about.

Again, grief, shock, anger - what can you say.

Gareth