Thursday, April 25, 2013
A letter from the White House to members of Congress said the assessment was based on "physiological samples" but called for a United Nations probe to corroborate it and nail down when and how they were used.
"We are continuing to do further work to establish a definitive judgement as to whether or not the red line has been crossed and to inform our decision-making about what we'll do next," a White House official said. "All options are on the table in terms of our response," the official added............
White House: US believes Syrian regime used chemical weapons - U.S. News