Venezuela's acting president said on Wednesday that "far right" figures in the United States were plotting to kill opposition leader Henrique Capriles in an increasingly volatile atmosphere ahead of an April 14 election.
Accusations are flying and emotions are running high in the South American nation of 29 million people since the death last week of former socialist leader Hugo Chavez.
"We have detected plans by the far right, linked to the groups of (former Bush administration officials) Roger Noriega and Otto Reich, to make an attempt against the opposition presidential candidate," Nicolas Maduro said.
He gave no more details, but said in a televised speech that the government had sent a senior general to meet with aides of Capriles.
The State Department in Washington declined any immediate comment and there was no immediate response from Capriles' camp.
Noriega, a former Assistant Secretary of State for Latin America under former President George W. Bush, denied Maduro's accusation. "It's absolute nonsense," Noriega said.
"They call you what they are and they accuse you of doing what they do. That is the way they operate," Noriega said.
Reich was not immediately available to comment. Noriega left the Bush administration in 2005. Reich was his predecessor.
Maduro did not explain why right-wing foreigners would want to bring down the business-friendly Capriles.
During the Chavez era, there were frequent claims of U.S. plots aimed at discrediting his self-styled revolution. Critics said they were a smokescreen to create a sense of "imperialist" threat and distract Venezuelans from daily problems.