"The proof was seen over the weekend: tear gas canisters marked 'made in America' fired at protesters, US-supplied F-16 jet fighters streaking over central Cairo, " he wrote.

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More proof that when a movie fad runs out of gas, it occasionally brings forth a final, anticlimactic belch.

NEWYORKER: Gunmen

However without definitive proof, questions remain and Dr Haji acknowledges there is a lack of proper research into CS gas use and SCD deaths.

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