WASHINGTON — The United States is "deeply disappointed" the Netherlands released a former Venezuelan military intelligence chief detained over U.S. drug trafficking allegations, and is "disturbed" at reports indicating Caracas used threats to obtain his freedom, the State Department said on Monday.

Instead of being extradited to the United States, retired Venezuelan General Hugo Carvajal flew home on Sunday from the Netherlands' Caribbean island of Aruba after the Dutch government ruled he had diplomatic immunity. He had been arrested on Aruba on Wednesday.

The Wall Street Journal reported on Monday that Carvajal's release came after Venezuela raised economic and military pressure on two Dutch islands in the Caribbean.

The newspaper quoted Aruba's chief prosecutor, Peter Blanken, as saying Venezuelan navy ships neared Aruba and Curaçao over the weekend as Dutch officials were considering how to deal with Carvajal.

"The threat was there," Blanken was quoted as saying.

Jubilant Venezuelan officials hailed Carvajal's release at a ruling Socialist Party congress, calling it a "victory" over U.S. ideological foes.

"We made a legitimate request for Carvajal's arrest in conformity with our treaty which governs extraditions between the United States, the Netherlands, and Aruba," State Department spokeswoman Jen Psaki said at a daily news briefing. She said Washington viewed Carvajal's claims of immunity as "beyond established international norms."

Opposition politicians in Venezuela and the U.S. government say Carvajal, who ran military intelligence from 2004 to 2008, bears responsibility for years of state connivance in the illegal drug trade.

Washington put Carvajal on a blacklist in 2008, accusing him of protecting cocaine shipments from seizure by Venezuela anti-narcotics authorities and providing weapons and shelter to Colombia's FARC rebels.

Carvajal denies those charges.

The State Department said Washington would continue efforts to bring Carvajal to justice, blaming Caracas for his release.

"We are also disturbed by credible reports that have come to us indicating the Venezuelan government threatened the governments of Aruba, the Netherlands, and others to obtain this result," Psaki said. "This is not the way law enforcement matters should be handled."

She did not elaborate on the nature of the purported threats or the source of the reports beyond saying they were "more than media reports."

Carvajal was considered one of the most powerful figures during the rule of the late socialist President Hugo Chavez, a U.S. antagonist.

The case had threatened a new flare-up in tense relations between Caracas and Washington, as well as potentially stirring up accusations of officially sanctioned drug trading by Venezuela.

Carvajal himself accused authorities in Aruba of corruption during a brief appearance on stage next to Venezuelan President Nicolas Maduro at the Socialist Party Congress on Sunday night.

"The judge and the prosecutor who proceed with my case are corrupt. I suspect they received money for what they did to me," he said. Carvajal gave no evidence to back up that accusation.