3 March 2006 Iranian born Mohammed Reza Taheri-azar committed a terrorist attack at University of North Carolina. He personally acknowledged his "foreign nationality" and birth in Tehran, Iran in a letter.
In the letter, he also stated:
> I have decided to take advantage of my presence on United States soil on Friday, March 3, 2006 to take the lives of as many Americans and American sympathizers as I can
After this, there was no similar attack in the US for over 10 years.
Then, 4 November 2016 I brought up this attack again by asking a Stack Exchange question, which was migrated to IslamSE.
Then, 28 November 2016 the attack was copied by Somali citizen Abdul Razak Ali Artan.