President Barack Obama said on Thursday if reports of chlorine gas attacks in Syria were confirmed, the United States would work with the international community to put a stop to them. At a news conference after his Camp David summit with Gulf allies, Obama said he has seen reports about the use of chlorine in bombs that have the effect of chemical *******. "And so we're working with the international community to investigate that," he said at the presidential retreat in Maryland. While chlorine itself is **t listed as a chemical ******, its use in such attacks may be prohibited, Obama said.