President Obama warned Wednesday that a potential U.S. military strike on Syria's ruling regime in retaliation for a chemical weapons attack on its own people would send "a pretty strong signal that they better not do it again."

In an interview with PBS's "NewsHour" at the White House after speaking at the 50th anniversary of the March on Washington, Obama confirmed that his administration has concluded that the Syrian government had used chemical weapons on a recent attack that killed scores of civilians. But the president emphasized that he has yet to make a decision about whether the U.S. response will include military strikes that his administration is reportedly weighing on Syrian government and military targets.

"We have concluded that the Syrian government, in fact, carried these out, and if so there need to be international consequences," Obama said. "I have no interest in any kind of open-ended conflict with Syria, but we do have to make sure that when countries break international norms in regards to chemical weapons that could threaten us, they are held accountable."