Sad day for America.
The Islamic extremists in the video operate under the Al Qaeda banner, with loyalty to leader al-Zawahri. They are fighting alongside of the Nusra Front, a rebel group in Syria.
The video was recorded today somewhere along the Turkey/Syria border.
Arabic: Boston in the United States
http://www.youtube.com/watch?feature...&v=XP6KC0-_TAw
"Two blasts at the same time. The first explosion hit-and-run and the second blast hit-and-Kill"