President Barack Obama says any effort in South Sudan to seize power through military force will lead the U.S. and others to cut off support.
The White House says Obama, who's vacationing in Hawaii, spoke with his national security team Saturday about the situation in South Sudan.
Obama's national security adviser, Susan Rice, briefed Obama by phone after leading a meeting with aides in Washington.
Earlier Saturday, gunfire hit three U.S. military aircraft trying to evacuate Americans in a remote region that's become a battle ground between South Sudan's military and renegade troops.
The White House says four wounded troops are in stable condition.
The White House says Obama told advisers that the conflict can be peacefully resolved only through negotiations.
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