The establishment media is reporting that authorities cannot identify a clear motive in the Washington Navy Yard shooting that left 12 victims dead.

WJLA-TV in Washington, D.C., reported that a motive remained unknown and Fox News said that Washington Mayor Vincent Gray confirmed there was still no motive for the shootings and no indication of terrorism, "although we haven't ruled that out."

CNN said there was "no specific reason" given for what spurred the violent attack that left nine whites, two blacks and an Indian man dead.

But at the bottom of NBC's report are details of how the suspect, Aaron Alexis, 34, was "not happy with America" and wrestled with another festering issue.

"He felt a lot of discrimination and racism with white people especially," Kristi Suthamtewkal told the reporter.

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She also said that Alexis had felt like he had been cheated out of money from the contract under which he had worked and complained that he was mistreated because he was black.

Colin Flaherty, who has documented hundreds of cases of black-on-white violence in recent years in his book "White Girl Bleed A Lot: The Return of Racial Violence to America and How the Media Ignore It," said it's not surprising that a facet such as antipathy over race would be overlooked or played down.

"Many people may remember Salon magazine's famous pronouncement: 'Let's hope the Boston Marathon bomber is a white American,'" he said, "Strange how anyone in the reporting business would hope for anything except getting the story straight."

Flaherty said regarding the Naval Yard shooting that "this kind of 'hope' turned a white officer on duty with a weapon into gun-toting suspect wearing camos, as was reported."

"The press cannot help it: They constantly misreport or ignore anything to do with race and violence," he said.

Media had reported additional suspects in the Navy Yard shooting who later turned out not to be suspects at all.

Investigative reporter and author Jack Cashill, whose book "If I Had a Son" tackles the broader implications of the Trayvon Martin case in Florida, said the evidence suggests whatever problems Alexis had "were aggravated by the message that the Democratic-media complex has been steadily pumping out, namely that a black American can never expect justice."

Cashill pointed out that racial tension has only increased under the first black president.

Read Cashill's full analysis of the Washington shooting suspect.

"A comprehensive poll taken by NBC News and the Wall Street Journal this summer showed that Obama failed in the one area in which even the opposition hoped he would succeed: bridging the racial divide," he said.

"In the month of his inauguration, 79 percent of whites and 63 percent of blacks held a favorable view of race relations in America. By July 2013, those figures had fallen to 52 percent among whites and 38 percent among blacks, a calamitous decline, rarely addressed, never explained."

The media carries a responsibility, he insisted.

"Although there are as many reasons for the decline in those numbers as there are for the decline in Alexis' mental health, one fact seems undeniable: the media have continued to drum into the head of African Americans the pervasiveness of racism in America, Obama's election notwithstanding. Indeed, by repeatedly interpreting criticism of Obama as racially based, the media have aggravated the tension between blacks and non-blacks."

Cashill said the in "his paranoia and rage, Alexis seemed not at all unlike former L.A. cop and fellow Navy reservist Christopher Dorner."

"In February 2012, Dorner found it much easier to hold a white establishment accountable for his homicidal spree than the personal demons that beset him,' Cashill said. "We do not have to wonder from which sources Dorner pulled his insights. He told us. 'Chris Matthews, Joe Scarborough, Pat Harvey, Brian Williams, Soledad O'Brien, Wolf Blitzer, Meredith Viera, Tavis Smiley and Anderson Cooper, keep up the great work and follow Cronkite's lead.' It remains to be seen from which source Alexis gleaned his inspiration, but it is not hard to imagine."

NBC reported Alexis "was so unhappy with his life in America – where he was beset by money woes and felt slighted as a veteran – that he was 'ready to move out of the country.'"

Alexis is the sole suspect in the shooting Monday of multiple victims at the Washington Navy Yard. Alexis died in the gun attack, as did 12 of the victims.

Suthamtewkal told the network Alexis was "tired of dealing with the government."

She is the wife of the owner of a Fort Worth, Texas, restaurant where Alexis had worked in exchange for room and board.

The suspect's mental state also is being investigated, as he had been cited for misbehavior while in the service and arrested at least twice. He also reportedly heard voices and had been treated by the government.

He most recently was working for a subcontractor for Hewlett Packard Enterprises called "The Experts" at the Navy Yard on a government contract and was given clearance to enter the Navy Yard.

Suthamtewkal said the suspect had spent a lot of time burning incense, and Alexis' anger seemed to have been increased when he returned from a contract job in Japan last November.

She also reported he had an attitude of entitlement, according to the NBC report, getting "annoyed when she couldn't give him rides, and he started eating the couple's food without permission."

WJLA reported that "federal, local and Naval officials say they're still working to figure out what motivated Alexis' horrific actions."

The attack is the largest shooting at a military base since the Fort Hood, Texas, attack by now-convicted murderer Nidal Hassan.

While CNN reported "no specific reason" had been determined as a motive, Alexis recently had told authorities "unseen individuals continued speaking to him through walls and the floor, and that they used 'some sort of microwave machine' to send vibrations into his body."

The suspect had been arrested for shooting out tires in Seattle in 2004 and shooting through an apartment floor in Texas in 2010. He also had a record of disciplinary actions during several years in the military.

The London Daily Mail reported a friend, Michael Ritrovato, claimed that Alexis had "trained" himself on a violent video game "then used buckshot bullets to see his victims get blown up."

Ritrovato said: "He wanted to see the blood and guts, that's what he'd seen on the video games. … That's what I saw when I looked at him playing those games, he would blow people apart."

But Ritrovato also said that Alexis, a recently converted Buddhist, "complained to him that he was the victim of racial discrimination."

A third person, Ty Thairintr, a member of the Buddhist temple in Fort Worth that Alexis attended, said, according to the Associated Press, Alexis told him he was upset "with the Navy because 'he thought he never got a promotion because of the color of his skin. He hated his commander.'"

Authorities say they recovered a shotgun and two handguns from the attack scene. Alexis allegedly bought a Remington 870 shotgun a few days before the attack and probably took the handguns from fallen victims at the Navy Yard, authorities said.

There have been several previous cases of black gunmen claiming their violence was fueled by racism.

In 1993, Colin Ferguson opened fire on a crowded train in New York and killed six passengers and wounded 19 others. He claimed in his trial that he was motivated by "black rage" and was driven insane by white racism.

In 2010, Omar Thornton shot and killed eight of his co-workers after being disciplined by his employer, Hartford Distribution, for stealing inventory. He claimed in a letter found after the rampage that he was motivated to kill by the racism he felt from his white co-workers.

Earlier this year, Christopher Dorner killed four people in a spree that terrified the Los Angeles area. He claimed he was motivated by "racism" from white police officers he felt when he worked as a policeman and deemed his firing from the police force was due to racism as well.