Amper, one of the crowd members, said she saw a "girl lying on the floor near me, and we had random people doing CPR on this girl." More than 20 minutes passed, she said, before "actual medical assistants came." Houston police and event security staff stopped the concert "as soon as the situation got to the point where it was overwhelming the resources there," but by then "the damage had been done," Peña, the fire chief, said.