The United States on Tuesday condemned the coup attempt in Sudan and warned against "external interference," as the nation transitions to democracy.

"Anti-democratic actions such as those of September 21 in Khartoum undermine the call of the Sudanese people for freedom and justice and place international support for Sudan, including the bilateral relationship with the United States, at risk," State Department spokesman Ned Price said.

"We condemn any external interference that seeks to sow disinformation and undermine the will of Sudan's people," he said in a statement, without elaborating.