By Frederik Pleitgen, Hamdi Alkhshali and Josh Levs, CNN

Syria will allow U.N. inspectors full access to any site of a purported chemical weapons attack, a top Syrian official told CNN on Sunday.

The agreement is effective immediately, Deputy Foreign Minister Faisal al Mekdad said.

And inspectors hope to begin their probe Monday at the suspected chemical attack site, the U.N. secretary-general's office said.

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