Assistant secretary of state for diplomatic security announces intention to resign . Richard Griffin gives no specific reason for resignation or a timetable . Blackwater issues appeal to people to stand up for themselves . NEW : Blackwater shooting victim says U.S. Embassy owes victims money .
Assistant secretary of state for diplomatic security announces decision to resign . Richard Griffin gave no specific reason for resignation or offered timetable . Blackwater issues appeal to supporters to stand up for company . NEW : Blackwater shooting survivor says U.S. Embassy offered victims money .