Syrian rebels used Sarin nerve gas, not Assad's regime: U.N. official - Washington Times

As of today, Monday 27 Aug., the UN still states that it was rebels who used sarin gas, not the Syrian government.

Despite this, US insists there is "evidence" that Assad is to blame and they are urging immediate action in Syria, even though the UN is still investigating the situation.

This sounds all too much like what happened in Iraq.