Hand prints are seen on a United Nations vehicle carrying a team of U.N. chemical weapons experts visiting one of the sites of an alleged chemical weapons attack in the Ain Tarma neighborhood of Damascus, Aug. 28.
Stringer / Reuters
Free Syrian Army fighters escort a convoy of U.N. vehicles during their visit to one of the sites of an alleged chemical weapons attack in Zamalka on Aug. 28.
U.N. investigators wearing gas masks inspect one of the sites of an alleged chemical weapons attack in Zamalka on Aug. 29.
A U.N. chemical weapons expert takes a picture of a woman affected by an apparent gas attack, at a hospital where she is being treated in the Damascus suburb of Zamalka on Aug. 29.
A team of U.N. experts investigated sites of apparent chemical weapons attacks on the outskirts of Damascus for the third straight day. The request by Syria to extend the inspectors stay has been rejected, so they will be wrapping up their investigation and are due to leave Syria on Saturday.
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A look back at the conflict that has overtaken the country.
The White House believes the evidence that the Syrian government used chemical weapons on its citizens is clear cut. NBC's Chuck Todd reports.