The tragic crowd surge at the Astroworld Festival in Houston has sparked conversation around crowd safety.

Steve Allen, founder of the consultancy firm Crowd Safety in the United Kingdom, joins In Depth to discuss security and crowd control measures.

The tragic crowd surge at the Astroworld Festival in Houston has sparked conversation around crowd safety.
Steve Allen, founder of the consultancy firm Crowd Safety in the United Kingdom, joins&nbsp;In Depth to discuss security and crowd control measures.

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