Al Qaeda is warning the U.S. that it has developed a new undetectable bomb that terrorists can get past airport security.

The step-by-step instructions were included in propaganda journal Inspire Magazine. Catherine Herridge explained that the magazine suggests taking common items like water bottles and cosmetics to build nonmetallic IEDs.

U.S. officials told Herridge that this is the first time they’ve seen so many instructions all packaged together with slick marketing.

The magazine talks specifically about aviation and identifies U.S. airlines as potential targets.

Watch the report above.