Complete the passage: pick from possible candidates.

(CNN) -- Are Syrian forces using chemical weapons in their years-long fight to hold on to power? That's what the head of the Israel Defense Forces intelligence research and analysis division said Tuesday, becoming the latest to allege that Damascus was employing weapons banned under international law against its own people. The claim further stoked the debate about the international community's role in Syria, where the United Nations estimated this month that 70,000 people have been killed since the conflict flared in March 2011. U.S. President Barack Obama, for one, has said the Syrian government's use of chemical weapons against its own people would be a "game changer" in how his and other nations address the crisis.

On Tuesday, his nation's top diplomat said Tuesday that the

OPTIONS:
- Barack Obama does not know definitively that such chemical weapons had been deployed.
- CNN does not know definitively that such chemical weapons had been deployed.
- Damascus does not know definitively that such chemical weapons had been deployed.
- Israel Defense Forces does not know definitively that such chemical weapons had been deployed.
- Israeli does not know definitively that such chemical weapons had been deployed.
- Russia does not know definitively that such chemical weapons had been deployed.
- Syria does not know definitively that such chemical weapons had been deployed.
- Syrian does not know definitively that such chemical weapons had been deployed.
- U.S. does not know definitively that such chemical weapons had been deployed.
- United Nations does not know definitively that such chemical weapons had been deployed.


U.S. does not know definitively that such chemical weapons had been deployed.