To prevent this from occurring, firearms manufacturers have the opportunity to implement distribution safeguards, common across many of the industries that manufacture products that can cause harm (such as explosives, fireworks, and pharmaceuticals).

CNN: Gun makers, help keep weapons out of criminals' hands

"This is part of an overall risk-based security approach, which allows Transportation Security officers to better focus their efforts on finding higher-threat items such as explosives, " a TSA spokesman told the Reuters news agency.

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St Andrews University physicists have made a laser which can trace vapours emitted by explosives such as TNT.

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Other U.S. government agencies such as the Bureau of Alcohol, Tobacco, Firearms and Explosives and the National Oceanic and Atmospheric Administration (NOAA) are dumping Blackberries for iPhones.

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An explosives expert told CNN the yellowness of the flame probably came from carbon or some organic fuel such as sugar that contains it.

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