President Assad called for a reconciliation conference with "those who have not betrayed Syria", to be followed by the formation of a new government and an amnesty.
The first stage of a political solution would require that regional powers stop funding and arming (the opposition), an end to terrorist operations and controlling the borders.
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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.