Report: Evidence found to support chemical attack in Syria

NBC reported on Thursday that two U.S. officials said that blood and urine samples from victims of the chemical attack in Syria over the weekend tested positive for a nerve agent and chlorine gas.

The backdrop: A few hours earlier, Defense Secretary Jim Mattis said that the administration was "looking for the actual evidence" to support a chemical attack, which affected 500 people. Mattis also said there would be a National Security Council meeting at the White House on Thursday to discuss options for response in Syria.