The gunman in the Colorado high school shooting has been identified by Arapahoe County Sheriff Grayson Robinson as 18-year-old Karl Pierson.
The gunman was found dead at the scene at Arapahoe High School in Denver.
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It means the petition, calling for a diverse panel to be appointed to the inquiry, has enough signatures to spark a debate in Parliament.
American businesses have begun severing ties with controversial pro-gun group the NRA in the wake of the latest mass school shooting.
The account claimed to have been started by Daisy's uncle, raising money for funeral costs - but police say the family are not involved.