From Sudden Jihad Syndrome:
It looks like the Muslim teen who opened fire on shoppers in a Salt Lake City mall is yet another case of "sudden jihad syndrome," a condition in which normal-appearing American Muslims abruptly turn violent. Taken together, this and other cases add up to an invisible jihad inside America. Several other Muslim-tied cases since 9/11 include: Naveed Afzal Haq, who went on a shooting rampage at a Jewish community center in Seattle; Egyptian national Hesham Mohamed Hadayet, who shot two and wounded three at an Israeli airline ticket counter at LAX; the D.C. snipers - John Muhammad and Lee Malvo, both black Muslim converts - who picked off 13 people in the suburbs; Omeed Aziz Popal, who took his SUV on a hit-and-run spree in San Francisco, mowing down pedestrians; Ismail Yassin Mohamed, who injured drivers and pedestrians in Minneapolis; and Iranian student Mohammed Reza Taheri-azar, who deliberately
rammed his SUV into a crowd at the University of North Carolina. They may seem isolated, but all have radical Islam at their nexus. These men act as conscripts called up for a mission, sick as it is.