The American administration has criticized the administration in Caracas over the death of a detained opposition figure, describing it as a "clear indication of the despicable nature" of President Nicolás Maduro's government.
The political prisoner passed away in his cell at the El Helicoide detention center in Caracas, where he had been held for over a year, according to human rights organisations and opposition groups.
The Caracas administration said that the man in his fifties showed signs of a myocardial infarction and was taken to a medical facility, where he died on Saturday.
This latest criticism from the United States is part of an growing war of words between the White House and President Maduro, who has accused America of pursuing regime change.
In recent months, the United States has expanded its armed forces deployment in the area and has executed a number of lethal strikes on vessels it says have been used for trafficking drugs.
US President Donald Trump has alleged Maduro directly of being the leader of one of the area's drug cartels—an accusation the Venezuelan president vehemently denies—and has threatened military action "via a land invasion".
"The detainee had been 'arbitrarily detained' in a 'facility for mistreatment'," declared the American diplomatic office for the region.
DÃaz was taken into custody in that year after joining several opposition figures to dispute the conclusion of that year's election for president.
Venezuela's pro-government election council declared Maduro the victor, even though counts by rivals suggesting their nominee had been victorious by a overwhelming majority.
The elections were largely criticized on the world stage as neither free nor fair, and ignited demonstrations across the nation.
The former governor, who was in charge of the coastal region, was indicted of "promoting hatred" and "extremism" for questioning Maduro's electoral win.
Venezuelan human rights group Foro Penal has voiced worry over declining situations for political prisoners in the South American state.
"Another detained dissident has lost his life in Venezuelan jails. He had been incarcerated for a year, in isolation," posted Alfredo Romero, the organisation's head, on a social network.
He said that he had only been permitted one encounter from his child during the full duration of his incarceration. He further stated that seventeen political prisoners have passed away in the country since that year.
Dissident factions have also denounced the administration over the death of DÃaz.
MarÃa Corina Machado, a prominent political rival who won this year's Nobel Peace Prize but who is in hiding to escape arrest, commented that DÃaz's demise was not an isolated incident.
"Tragically, it contributes to an alarming and difficult sequence of fatalities of detained dissidents imprisoned in the aftermath of the after the vote crackdown," she wrote.
The coalition of rivals stated that the former governor "was an unjust death".
His own party, Democratic Action (AD), also honored the former governor, noting he had been unjustly detained without fair treatment and had remained in conditions "that infringed upon his fundamental rights".
Frictions between the United States and Venezuela have become increasingly strained over what Trump has called actions to curb the influx of drugs and immigrants into the US.
Maduro has for his part claimed the US of using its war on drugs as an pretext to depose his regime and access Venezuela's vast petroleum resources.
The US has also stationed a significant fleet—its largest presence in the area in decades—along with thousands of soldiers.
In a related development, the Venezuelan army according to reports inducted more than 5,600 recruits in one go on Saturday, in answer to what army commanders termed US "aggression".
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