What Happened At Astroworld? Crowd Safety Expert Explains : Consider This from NPR Who is to blame for the deaths of nine people at the Astroworld Festival last Friday? Houston police have opened a criminal investigation and concertgoers have already filed more than 20 lawsuits against the event organizers and rapper Travis Scott, who continued to perform for more than half an hour after officials declared a mass casualty event.

Crowd safety expert Keith Still explains the science behind how a concert crowd can transform into an uncontrollable mass that threatens human life.

Houston Chronicle music critic Joey Guerra, who attended the festival, grapples with how music fans are processing the tragedy.

In participating regions, you'll also hear a local news segment that will help you make sense of what's going on in your community.

Email us at considerthis@npr.org.

What Went Wrong At Astroworld? The Deadly Dynamics Of Crowd Surge

What Went Wrong At Astroworld? The Deadly Dynamics Of Crowd Surge

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Fans during 2021 Astroworld Festival at NRG Park on November 05, 2021 in Houston, Texas. Erika Goldring/WireImage/Getty Images hide caption

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Erika Goldring/WireImage/Getty Images

Fans during 2021 Astroworld Festival at NRG Park on November 05, 2021 in Houston, Texas.

Erika Goldring/WireImage/Getty Images

Who is to blame for the deaths of nine people at the Astroworld Festival last Friday? Houston police have opened a criminal investigation and concertgoers have already filed more than 20 lawsuits against the event organizers and rapper Travis Scott, who continued to perform for more than half an hour after officials declared a mass casualty event.

Crowd safety expert Keith Still explains the science behind how a concert crowd can transform into an uncontrollable mass that threatens human life.

Houston Chronicle music critic Joey Guerra, who attended the festival, grapples with how music fans are processing the tragedy.

In participating regions, you'll also hear a local news segment that will help you make sense of what's going on in your community.

Email us at considerthis@npr.org.

This episode was produced by Brianna Scott and Mano Sundaresan. It was edited by Fatma Tanis and Christopher Intagliata. Our executive producer is Cara Tallo.