UN to Investigate Chemical Weapons in Syria

Animal carcasses lie on the ground, killed by what residents said was a chemical weapon attack days earlier,Khan al-Assal Syria, March 23, 2013.

A general view shows Khan al-Assal near where residents say a March 19 chemical weapon attack occurred.

Residents and medics transport a Syrian Army soldier, wounded in what they said was a chemical weapon attack near Aleppo, to a hospital, March 19, 2013.

People breathe through oxygen masks as they are treated at a hospital in Aleppo, March 19, 2013.

A general view shows the site near Aleppo where residents say a March 19 chemical weapon attack occurred.