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Perez said he was released within four hours of arriving at a hospital, and that a doctor treating him told him ICE agents were in a hurry to transfer him to a detention center.

Initial efforts to arrest Castro were thwarted when the ICE agent returned to his home state of Texas, leading Minnesota officials to issue a warrant for his arrest.

Alon later launched federal proceedings against the US prison authorities, and argued that her incarceration in a men's prison and the treatment she received violated her rights.

Minnesota authorities had argued in court that Castro, jailed in the Gulf Coast border city of Brownsville, Texas, since May 29, was a flight risk if he were released.

“These documents expose an operation that demands answers from the highest levels of government,” said NIAC Policy Director Ryan Costello.

Blerim Skoro has maintained that US authorities promised him safety in return for his information, though he was deported upon his release in 2007 despite being married to an American.

The DHS said Chajon-Raxon was "released from ICE custody on July 22" but did not provide more details on that. The DHS statement did not mention when Chajon-Raxon died.

Edwin Lopez-Cornejo, an immigrant from El Salvador, was pronounced dead on Saturday at a US Immigration and Customs Enforcement detention center in New Jersey.

The shooting involved US Immigration and Customs Enforcement; details are being confirmed.

Family members, lawmakers and immigrant advocates called for an independent investigation after an ICE officer fatally shot a longtime Houston resident during a targeted enforcement operation.