President Obama has issued a new warning to Syrian President Bashar al-Assad over the use of chemical weapons. At a nuclear proliferation gathering on Monday, Obama said any use of chemical weapons by Syria would lead to unspecified “consequences.”

President Obama: “Today I want to make it absolutely clear to Assad and those under his command: The world is watching. The use of chemical weapons is and would be totally unacceptable. And if you make the tragic mistake of using these weapons, there will be consequences, and you will be held accountable.”

The White House has issued similar statements in the past toward Syria but has yet to provide specifics on what actions it would take.