There has been another night of clashes between anti-Mursi protesters and police in Cairo.
Some demonstrators protesting against President Mohamed Mursi's decree wore gas masks as they grabbed tear gas canisters fired by police and threw them back at them.
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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.