Chris Matthison was near to the crash site.
I heard a very unusual dull thud, then there was silence. The silence really took my imagination. Emergency services responded very quickly.
There was some damage to the crane. It's possible the crane is lying across Nine Elms road. The top of the nearest building is steeped in mist and difficult to see.
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Brighter skies developing across northern Britain and Northern Ireland with some sunshine tomorrow but feeling cooler again.