A British firm manufactured some of the tear gas used by Egyptian security forces battling pro-democracy protesters in Egypt's Tahrir Square. CS gas canisters fired at civilians during recent clashes were produced by British defence contractor Chemring Defence, formerly known as PW Defence, the company confirmed this weekend. A spokesman said the gas is thought to have been sold to the Egyptian army more than a decade ago or, alternatively, reached Egyptian military via a third country...[C]ritics say Egyptian use of British-made products to quash political dissent reveals “serious flaws” in the UK's controls on arms exports to the Middle East.