A magazine run by the Yemeni group al-Qaeda of the Arabian Peninsula has published a list of tips on how to kill Americans.
"A random hit at a crowded restaurant in Washington, DC at lunch ... might end up knocking out a few government employees," one article reads, according to the private SITE Intelligence Group, which studies, tracks and analyses the global jihadist network and terrorism financing.
The edition also includes "The Ultimate Mowing Machine," which describes how to use a pickup truck "as a mowing machine, not to mow grass, but mow down the enemies of Allah." It says "to achieve maximum carnage, you need to pick up as much speed as you can while still retaining good control . . . to strike as many people as possible in your first run."
The magazine includes two articles by renegade US cleric Anwar al-Awlaki, who is on a US government kill-or-capture list for his alleged roles in the attempted Christmas Day airliner bombing, and inspiring the Fort Hood shooting of 13 troops. Army Major Nidal Hassan has been charged in the killings.
There's also an article by the so-called American al-Qaeda, Adam Gadahn.
Another American, Samir Khan, describes how he went from online jihadist in North Carolina to full-time terrorist in Yemen. The article is entitled, "I Am Proud to be a Traitor to America."
Al-Qaeda in the Arabian Peninsula has taken root in Yemen's remote and mountainous Shabwa province, far from the reach of the country's weak central government.
The group rose toward the top of the security agenda of the United States and other world powers after it was linked to the failed Christmas Day attempt to down a Detroit-bound US airliner. The would-be bomber had explosives sewn into his underwear.
The magazine's content reveals the group's evolving strategy of rejecting easier-to-stop spectacular attacks in favour of one-man operations, using everyday objects.
That shows the organisation is "increasingly agile, lethal and opportunistic," according to Yemeni scholar Christopher Boucek from the Carnegie Endowment.
The first edition included an article called "Make a Bomb in the Kitchen of Your Mom."
In the introduction to the latest magazine, the editors boast of "recent US assessments" that declared al-Qaeda of the Arabian Peninsula "one of the most dangerous branches of al-Qaeda." It concludes, "You haven't seen anything yet."