"American airports are increasing security measures across the country in the wake of dual terrorist attacks in Paris and the publication by al Qaeda of what counterterrorism experts say appears to be the most detailed, and potentially lethal, bomb recipe ever to be sent to their followers."
The top security chiefs for major American airlines have been briefed about the troubling publication, according to a senior U.S. law enforcement official.

Department of Homeland Security Secretary Jeh Johnson said Monday the Transportation Security Administration has stepped up random searches of travelers and carry-on luggage in addition to enhanced screening that was ordered this summer at “certain foreign airports.”

Read the full article: http://abcnews.go.com/International/us-steps-airport-security-al-qaedas-hidden-bomb/story?id=28194349