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Three months on, what is the scene now at Ground Zero, the remains of the World Trade Center? We talked to those with first hand experience of the work to date - and the task that still remains.

Since 11 September, emergency teams and demolition experts have cleared thousands and thousands of tonnes of rubble from the site.

At the same time, they have recovered the remains of as many people as they could - but many more will never be found.

Click here to find out how families of the lost are pinning their hopes on DNA identification.