Palestinian official: 15 dead, more than 150 wounded in Gaza market strike--AP

Possible chemical weapons in Syria

CBSTV Videos 4:01 mins

The White House said there is evidence that the Syrian regime has used nerve gas against its people in at least two attacks. President Obama issued a stern warning to Syrian dictator Bashar Al-Assad and his military. David Ignatius joins "CBS This Morning: Saturday" co-hosts to talk about the issue.

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