At least seven of the 10 dead after the Astroworld Festival were clustered in a small area enclosed on three sides by metal barriers that became dangerously crowded, according to a Washington Post investigation.

The review — based on dozens of videos examined for when and where each was taken, interviews with witnesses, and an analysis by crowd experts — reveals how a crowd surge at a performance by rapper Travis Scott turned one pocket of the audience into an epicenter of chaos and distress.

Ten fans at the Nov. 5 concert in Houston died and dozens more were injured, making it one of the most deadly concerts in the nation’s history. The Post found that most of those who died were close to each other in the viewing area’s south quadrant, where witnesses described people collapsing under the pressure of the crowd.

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