Sany SCC1020 Wind Power Truck Crane Accident

I have received some photos yesterday on an crane accident of the Sany SCC1020 truck crane. The truck crane was a wind power special application truck crane which has a double telescoping boom structure, adopted for all 2.0-2.5 MW wind motor hoisting works.

While there hasn’t been any news release on the crane accident, I have managed to get some photos from an anonymous source. What do you think had happened that caused the crane to collapse ?

The second section of the boom is bent and fallen sideways onto the ground.

an overview photo of the collapsed scc1020
An overview photo of the collapse crane.

what could have happened to make it collapsed this way ?
Was outriggers a possible factor of the collapse or ground stability ?

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