An unknown number. The perps were loaded with explosives, obviously preparing to attack more innocents, until cops took the brunt, including one explosion similar to the marathon bombs. One of those cops took a bullet to the groin and almost bled out. He's still in critical condition last I heard.
And how many citizens did they instill terror into?
If it was THEM who "instilled terror" in the people, it's amazing how all that fear completely went away when the last perp was in custody, and that "terror" turned to cheers for every law enforcement vehicle that came down the street.
And was the local Mosque raided? Ever?
Or did they just get a polite visit from FBI critters who respectfully removed their shoes as they entered, and used soft voices?