"There were no defensive wounds" on Martinez and Garland and "there was no third-party blood or DNA evidence from the scene or from the agents' clothing", reads a memo sent by US Customs and Border Protection Commissioner Kevin McAleenan.
"To date none of the more than 650 interviews completed, locations searched, or evidence collected and analyzed have produced evidence that would support the existence of a scuffle, altercation, or attack on November 18, 2017", the bureau's El Paso office said in a statement on Wednesday.
An informant familiar with human smugglers told Border Patrol officials that a pair of brothers recently smuggled across the border had admitted to assaulting the agents, according to a warrant later filed to search the brothers' auto in New Mexico. One of them, Rogelio Martinez, died of his wounds. Garland was released from the hospital but can't remember anything about the incident, officials said.
The FBI is offering a reward for information and said that 37 of its field offices were involved in the "top priority" investigation, which included 26 searches in Texas and New Mexico and turned up two "persons of interest" who were found not to be involved, while "several individuals" were arrested on suspicion of an unrelated immigration offence.
"The dispatcher also wrote in a log: "(He) thinks they (both agents) ran into a culvert", the Federal Bureau of Investigation statement said.
A Customs and Border Protection spokesperson declined to comment on the case.
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The autopsy report, released Tuesday night, said Martinez suffered brain hemorrhaging and fractures to the skull, eye socket, right ribs and collarbone, as well as contusion of his right shoulder, according to Dr. Janice Diaz-Cavalliery, assistant El Paso County medical examiner.
The agent had cuts in his scalp, the report says, and a large bruise on his right shoulder.
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Despite the FBI's conclusion that there's no evidence of an attack, the Border Patrol union still believes the agent's injuries were the result of an attack. "Our view hasn't changed". Chris Cabrera, a spokesman for the local union, said the two were likely hit with rocks. "It seems to me that they don't have any leads". Ted Cruz, R-Texas, and others issued similar statements, alleging that the agents had been "attacked".
Texas politicians - including Gov. Greg Abbott and Sen. President Trump tweeted about the death, writing, "Border Patrol Officer killed at Southern Border, another badly hurt".
Culberson County Sheriff Oscar Carrillo, who was among the first at the scene of the incident, had early on told the Dallas Morning News that the agents may have been side-swiped by a truck. "He obviously had to have put up a fight", Ochoa said.
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"I find it hard (to believe) that a fall could have caused all the damage that he had", she said. "From the damage to his face, there's no way - there's no way", she said.
To this day, no one can tell Ochoa what happened to the man she was to marry.
But the F.B.I. report makes clear that the authorities knew very little in the moments after the episode.
Cornyn, who tweeted in November that he told Martinez's mother that those responsible would be found and held accountable, told reporters during a conference call Thursday that it appeared the death was indeed the result of an accident.
Garland has remained out of the public eye.
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