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 / Updated  / Source: Associated Press

LAS VEGAS — A U.S. judge in Nevada declared a mistrial Wednesday in the case against a states' rights figure, his two sons and another man accused of leading a 2014 armed standoff with federal agents during a cattle grazing dispute.

Chief U.S. District Judge Gloria Navarro in Las Vegas dismissed a jury seated last month for the long-awaited trial of Cliven Bundy, his sons Ryan and Ammon Bundy and self-styled Montana militia leader Ryan Payne.

It is the latest in a string of failed prosecutions in Nevada and Oregon against those who have opposed federal control of vast swaths of land in the American West.

Image: Nevada rancher Cliven Bundy and his sons Ammon Bundy and Ryan Bundy and co-defendant Ryan Payne.
Nevada rancher Cliven Bundy and his sons Ammon Bundy and Ryan Bundy and co-defendant Ryan Payne.AP

Jurors in Portland, Oregon, acquitted the two Bundy sons of taking over a U.S. wildlife refuge in Oregon for more than a month in early 2016 amid calls for the U.S. government to turn over public land to local control.

In the Nevada case, Navarro faulted federal prosecutors for failing to turn over all evidence to defense attorneys, including records about the conduct of FBI and Bureau of Land Management agents during the standoff.

"The government is obligated to disclose all evidence that might be favorable" to the defense, the judge said.

The case stemmed from an armed confrontation that capped a decadeslong dispute over Cliven Bundy's refusal to pay grazing fees. The 71-year-old rancher says his family has grazed cattle for more than a century in the area and insists public land belongs to states, not the U.S. government.

Related: FBI Agent Charged With Lying About Fatal Oregon Refuge Shooting

Government agents began rounding up his animals. The four on trial were accused of enlisting armed gunmen to force government agents to abandon the effort.

"A mistrial is a very bad result for the government," said Ian Bartrum, a University of Nevada, Las Vegas, law professor who has followed the case closely.

Bartrum had cast the trial as a test of whether U.S. authorities could enforce their own land policy in Western states where the government owns or controls vast expanses.

"It looks even worse because it isn't the sort of jury nullification we've seen before, but actual incompetence (or worse) by the prosecution," Bartrum said in an email. "It certainly erodes a lot of confidence in the federal government's motives."

Acting U.S. Attorney Steven Myhre had no immediate answer about whether prosecutors would retry the case. If so, the Bundys and Payne still would face 15 felony charges including assault and threats against federal officers, firearms counts, obstruction and extortion.

Image: Cliven Bundy
Cliven Bundy stands at the Bundy ranch near Bunkerville, Nevada on April 5, 2014.John Locher / AP file

Prosecutors also failed to win full convictions against others at the tense confrontation near Bunkerville, about 80 miles northeast of Las Vegas.

Six men who acknowledged carrying assault-style weapons faced a trial and a retrial. Two were acquitted, two were convicted of some charges and two are free after pleading guilty to misdemeanors to avoid a third trial. None was found guilty of a conspiracy charge.

In the case against the Bundys, the judge hinted last week that trouble was afoot. She sent the jury home to review sealed documents following closed-door hearings over complaints about the conduct of FBI and Bureau of Land Management agents during the standoff.

Jurors got a glimpse of the claims when Ryan Bundy, who represented himself, spoke at opening statements about seeing government snipers and surveillance cameras positioned on hilltops surrounding his family home in the days before armed supporters answered his family's calls for help.

Related: First Prison Term Handed Down in Bundy Armed Standoff in Nevada

A whistleblower memo by a lead U.S. Bureau of Land Management investigator that was released last week alleges widespread bad judgment, bias and misconduct, as well as "likely policy, ethical and legal violations among senior and supervisory staff" in the days leading up to the standoff.

The memo said agents who planned and oversaw the cattle roundup mocked and displayed clear prejudice against the Bundys, their supporters and Mormons.

The investigator, Larry Wooten, said he was removed from the investigation last February after he complained to the U.S. attorney's office in Nevada.

The judge freed the Bundy sons and Payne to house arrest during the trial after nearly two years in jail. Cliven Bundy refused the judge's offer, with his lawyer saying the patriarch was holding out for acquittal.