The victims ranged in age from 8 months to 43 years old.
"They were ambushed by the Mexican cartels; shot, burned, and murdered in cold blood. These were innocent civilians, American citizens simply trying to live peaceful lives," relative Kendra Lee Miller said in a lengthy Facebook post Tuesday morning.
Read on for a list of the innocent family members killed in the attack.
Rhonita Maria Miller, 30, and four of her children
Rhonita Maria Miller’s burned-out bullet-ridden SUV was reportedly found outside the town of Bavispe, where the settlement is located.
Miller, 31, was killed along with four of her children: Howard Jacob Miller, Jr., age 12; Krystal Bellaine Miller, 10; and 8-month-old twins Titus Alvin Miller and Tiana Gricel Miller.
They were all shot and burned in their vehicle, Miller wrote on Facebook. She said only a few bones and ash remained of her family.
Christina Marie Langford Johnson, 31
Christina Marie Langford Johnson, 31, was found in a separate location later Monday, relative Lafe Langford Jr. told the Salt Lake Tribune.
Before her death, she placed her 7-month-old daughter Faith on the floor of the bullet-ridden vehicle, where she was found alive and unharmed in her car seat, Miller wrote on Facebook.
Johnson was 19 days away from her 32nd birthday, Miller wrote.
Dawna Ray Langford, 43, and 2 children
Dawna Ray Langford, 43, and her two children, 11-year-old Trevor Harvey Langford and 2-year-old Rogan Jay Langford were all shot to death, Miller wrote.
Similar to Johnson, Langford’s body was discovered in a separate location, Langford Jr. told the Tribune.
8 children survived
Between the three families, 8 children miraculously survived, with some suffering injuries.
Devin Blake Langford, 13, hid his bleeding siblings in nearby bushes while he made the 6-hour, 14-mile trek back to La Mora to get help, Miller wrote.
Miller’s post detailed the injuries of the surviving Langford children: Kylie Evelyn, 14, was shot in the foot; McKenzie Rayne, 9, had a bullet graze her arm; Cody Greyson, 8, was shot in the jaw and leg; Zander Boe, 4, was shot in the back; and 9-month-old Brixon Oliver was shot in the chest and grazed on his wrist.
Devin and his 6-year-old brother Jake Ryder were uninjured, she said.
Alfonso Durazo, Mexico's top security official, said that six children were wounded in the attack, with five transferred to hospitals in Phoenix, Ariz.
All the victims are believed to be members of the extended LeBaron family, who live in a religious community in La Mora, northern Mexico, a decades-old settlement in Sonora state founded as part of an offshoot of The Church of Jesus Christ of Latter-day Saints around 70 miles south of Douglas, Arizona.
Relatives said the group was attacked while traveling in a convoy of three SUVs. Durazo said the gunmen may have mistaken the SUV convoy for rival gangs. He said the Sinaloa cartel has an important presence in the area, but is fighting for the territory with rivals.
Meanwhile, Miller said that the families were still seeking answers as they await justice.
Trump in a tweet following the attack called on Mexico wage “war” on the drug cartels.
"This is the time for Mexico, with the help of the United States, to wage WAR on the drug cartels and wipe them off the face of the earth,” he wrote. “We merely await a call from your great new president!"
But Mexican President Andrés Manuel López Obrador later responded: "The worst thing you can have is war."
Fox News' Danielle Wallace and Caleb Parke and The Associated Press contributed to this report.