HOUSTON (AP) — A congressional committee has launched an investigation into the promoter of the Astroworld music festival in Houston, in which 10 people were killedduring a massive crowd surge and attendees were packed so tightly that many could not breathe or move their arms.

The House Oversight and Reform Committee sent a letter Wednesday to Live Nation Entertainment Inc.’s president and CEO, Michael Rapino, asking for information about the company’s role in the Nov. 5 festival and concert by rap superstar Travis Scott.

Information the committee requested included details about security, crowd control and mass casualty incident planning; details about any pre-show briefings by Live Nation or is subsidiaries on any safety concerns; and what steps the concert promoter will take to prevent injuries or deaths at future events.

“Recent reports raise serious concerns about whether your company took adequate steps to ensure the safety of the 50,000 concertgoers who attended Astroworld Festival,” the committee said in the letter.

The committee is requesting that Live Nation provide documentation on the questions by Jan. 7 and that it provide a briefing to committee members by Jan. 12.

Such a briefing would be behind closed doors and not open to the public.

“We are assisting local authorities in their investigation and will of course share information with the Committee as well. Safety is core to live events and Live Nation engages in detailed security planning in coordination with local stakeholders including law enforcement, fire and EMT professionals. We are heartbroken by the events at Astroworld and our deepest sympathies go out to the families and friends of the victims,” Live Nation said in a statement.

The youngest of the 10 victims was 9-year-old Ezra Blount. The others who died as headliner Scott took to the stageranged in age from 14 to 27.

Some 300 people were injured and treated at the festival site and 25 were taken to hospitals.

Last week, officials announced that the people killed at the concert died from compression asphyxia. A medical expert says the pressure from the crowd surgeat the event was so great that it quickly squeezed all the air from the lungs of the victims, causing them to pass out within a minute or so and die because critical organs, such as the heart and brain, were depleted of oxygen.

Nearly 400 lawsuits have been filed over injuries and deaths at the concert, including many against Live Nation and Scott.

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Find the AP’s coverage of the Astroworld festival: https://apnews.com/hub/astroworld-festival-deaths

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Follow Juan A. Lozano on Twitter: https://twitter.com/juanlozano70