are capable of carrying out terror attacks without detection by American authorities.

The shift to lone-wolf attacks highlights al Qaeda's continued influence and brand strength among jihadists following the rise of splinter groups such as ISIS. Al Qaeda is still a primary source of concern for the U.S. intelligence community, which continues to see the group as a central threat against American safety.

Al-Asiri emphasizes in his manifesto, published in the latest issue of al Qaeda's chief propaganda organ Inspire Magazine, that lone jihadists could easily carry out terror attacks on bustling locales, such as airports and train stations.

"We will be focusing on targeting means of transportation," the terror leader writes in the English-language article, which was first highlighted by the Middle East Media Research Institute. "We will explain morecircumstances at hand."

The article ends with al Qaeda's traditional call to violence against America and its Western allies.

"Target America, by Allah they are in a great predicament," the article states. "We should continue to focus our efforts against it until the world gets rid of this international system led by America, and until Muslims enjoy freedom to practice their faith, freedom to apply the Laws of Allah and until Muslims secure themselves, wealth and resources from the hands of America."