The widow of soldier Lee Rigby broke down in tears as two men denied his murder.
Rebecca Rigby watched tearfully as Michael Adebolajo, 28, and Michael Adebowale, 22, appeared at the Old Bailey via videolink.
Both wearing red T-shirts and pale trousers, they appeared from separate rooms for today's hearing.
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Two-year-old Casper Platt-May and his six-year-old brother Corey died in the crash in Coventry on Thursday.
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.