Within the three page email we find:
It is no doubt that we today Muslim, followers of Islam are attacked and occupied by foreign infidel forces. The crusade has already started against Islam and Muslims with cartoons of our beloved Prophet PBUH as War drums.
We don't yet know why he chose the Times Square location, but this reference to how offensive he finds cartoons of Mohammed leaves open the possibility that he may have been reacting to the recent South Park episode put out by Comedy Central.
Hat Tip Women Against Shariah