Death of Venezuela's Opposition Figure in Detention Described as 'Abhorrent' by US Officials.

The United States has lashed out at the Venezuelan government over the death of a jailed political dissident, calling it a "clear indication of the despicable character" of President Nicolás Maduro's regime.

The former governor was found dead in his prison cell at the El Helicoide detention center in Caracas, where he had been incarcerated for more than a year, as reported by advocacy organizations and opposition groups.

The Caracas administration said that the man in his fifties showed symptoms of a myocardial infarction and was transferred to a hospital, where he died on the weekend.

Growing Tensions Between US and Caracas

This latest statement from the US is part of an intensifying war of words between the Trump administration and President Maduro, who has alleged Washington of seeking a change in government.

In recent months, the United States has expanded its military presence in the area and has executed a number of fatal operations on ships it says have been used for trafficking drugs.

US President Donald Trump has alleged Maduro directly of being the leader of one of the country's drug cartels—an accusation the Venezuelan president vehemently denies—and has hinted at military action "via a land invasion".

"He had been 'held without cause' in a 'center of abuse'," declared the US State Department's Bureau of Western Hemisphere Affairs.

Background of the Arrest

The opposition figure was detained in that year after being among many dissidents to challenge the results of that period's national vote.

Venezuela's state-run national electoral body proclaimed Maduro the victor, even though figures from dissidents indicating their candidate had triumphed by a overwhelming majority.

The elections were largely criticized on the world stage as flawed and unfair, and sparked protests across the country.

The former governor, who led the island state, was accused of "stoking division" and "extremism" for disputing Maduro's declaration of success.

Reactions from Rights Groups and the Political Rivals

Local rights organization Foro Penal has raised concerns over declining conditions for jailed opponents in the country.

"Yet another jailed opponent has lost his life in Venezuelan detention centers. He had been held for a year, in isolation," stated Alfredo Romero, the body's head, on a social network.

He noted that Díaz had only been allowed one visit from his daughter during the full duration of his detention. He also mentioned that over a dozen detained dissidents have died in the nation since that year.

Opposition groups have also condemned the regime over the passing of the former governor.

María Corina Machado, a well-known dissident figure who was awarded this year's Nobel Peace Prize but who stays in seclusion to escape arrest, said that his death was not a one-off event.

"Unfortunately, it contributes to an alarming and difficult chain of fatalities of political prisoners detained in the context of the post-election repression," she said.

The Democratic Unitary Platform stated that the former governor "was an unjust death".

Díaz's own party, Democratic Action (AD), also remembered the ex-leader, noting he had been unjustly detained without due process and had been kept in situations "which violated his fundamental rights".

Broader International Tensions

Strains between the US and Venezuela have become progressively worse over what Trump has labeled actions to stem the influx of narcotics and migrants into the United States.

• US bombings on ships in the Caribbean and Pacific have killed more than 80 individuals.
• Trump has alleged Maduro of "releasing inmates from his jails and insane asylums" into the US.
• The US has classified two Venezuelan drug cartels as terrorist organisations.

Maduro has for his part claimed the US of using its anti-narcotics campaign as an excuse to overthrow his regime and gain control of Venezuela's enormous oil reserves.

The United States has also deployed a sizable armada—its biggest deployment in the area in many years—along with many soldiers.

In a connected move, the Venezuelan army according to reports enlisted thousands of troops in a single event on the weekend, in reaction to what military leaders called US "aggression".