The Standard newspaper in the UK reported that the threat may be from “stealth” bombs that can't be detected using the screening technologies commonly used by airports. Other media outlets speculate that the devices may be built into specific mobile phone models, or that the people carrying these devices may be passport holders from the US and other western countries. However, this is speculation that has not been either confirmed or denied by official sources in the US and elsewhere.
On July 2nd and 3rd, Todd Curtis of AirSafe.com was interviewed several times by the BBC about several issues that were raised by this latest security situation.
Interview on Rudy Maxa's World
Todd Curtis was also interviewed on this issue on July 5, 2014 on Rudy Maxa's World.
Interview on July 7, 2014 with the Wall Srteet Journal
You can also find additional airline security information at http://security.airsafe.com, or at the following links: