911 plot took almost 2 years to unfold and almost came apart
before it started because the first group sent to US while
fanatical lacked fluency in English and ability to operate
in a western society.
Only after “Hamburg (Germany) group showed up did it proceed
Simple attack like Boston Marathon bombing or shooting up shopping mall is in realm of possibilty - anything more
sophisticated is problematic
Just down the hall from my office is a program that teaches English to foreign nationals so they can apply to attend college in the US. Want to guess the fastest growing group of people attending this program over the last several years? You got it, muslims.