"You can't imagine that there are people who could do such a disgusting thing like this, innocent women, innocent children", he said, fighting back tears.
Relatives of the victims rejected the mistaken identity theory, arguing that shell casings and personal belongings found near the torched auto suggest the attackers came close and made sure everybody was dead before igniting the vehicle.
"That is so beyond understanding, we are living like we are in Afghanistan, 100 miles in the USA boundary", stated LeBaron. Around the ambush scene, which stretched for miles, investigators found over 200 shell casings, mostly from assault rifles.
And it called into question President Andrés Manuel López Obrador's "hugs, not bullets" security strategy of trying to solve underlying social problems instead of battling drug cartels with military force.
Now breakaways from the official Church of Jesus Christ of Latter-day Saints, which banned polygamy in 1891, they have lived in Mexico for generations, farming the land.
The slaughter of those girls and kids in their automobiles on an isolated dirt road in the border state of Sonora sparked revulsion and outrage in the U.S. as Trump is gearing up to get his re-election effort in 2020.More news: 'With Leo, anything is possible' - Valverde hails Messi
But Julian LeBaron, whose brother Benjamin, an anti-crime activist, was killed by cartel gunmen in 2009, disputed that.
Mourners filed past to view the bodies and pay their final respects to Dawna Ray Langford, 43, and her sons Trevor, 11, and Rogan, 2.
Her mother Christina Langford Johnson, who died in the tragedy, has been credited with saving her daughter's life after stashing her auto seat on the floor of her SUV as gunfire rang out. Her daughter Faith Marie Johnson, 7 months old, was found unharmed in her auto seat.
Leah Langford-Staddon told The Associated Press that her mother and another sister, Amy, came to Arizona with as many belongings as they could pack into their vehicles. "She gave her life to try and save the rest".
"It's devastating", said Leah Staddon, a relative who grew up in La Mora before moving to Arizona. She was listed as missing for a while.
"The assets that they've acquired down there are tremendous", he said. Staddon said her nephew's wife, 33-year-old Rhonita Miller, and four of her children - ages 8 and 10, and 8-month-old twins - were among the victims in what may have been a tragic case of mistaken identity.More news: Michael Bloomberg takes a step towards the USA presidential race
The youngest of Devin's siblings, 9-month old Oliver, was shot in the chest; 8-year-old Cody had bullet wounds to the jaw and the leg, while Xander, 4, had been hit in the back.
"The U.S.is the biggest consumer of everything they're fighting for down here".
Trump tweeted that a "wonderful family" got "caught between two vicious drug cartels". "By declaring war?" he said after the attacks.
Later, the two leaders spoke by telephone, and Trump offered USA assistance "to ensure the perpetrators face justice", the White House said without giving details.
Erasmo Valenzuela, a 50-year-old Mexican who has worked with the families in La Mora for a decade, said he has heard that two or three families intend to leave. The motive in the killings still isn't known, though Mexican authorities have suggested the victims were in the wrong place at the wrong time as competing cartels fought over turf and may have mistaken the SUVs the women and children were in for rivals who travel in similar vehicles.
Mexican Foreign Minister Marcelo Ebrard said Mexico "will share information" with the US Federal Bureau of Investigation (FBI) in the ongoing probe.More news: Toyota and BYD join forces for EV development in China
Since then, the country has registered more than 250,000 murders. "I felt that this was in broad daylight and...no one could have done that not knowing what they were doing".