A Mormon teen recalled his harrowing six-hour trek to get help after members of his family were slaughtered in Mexico — and how he constantly feared he was being trailed by the cartel killers.

Devin Langford, 13, told ABC’s “Good Morning America” how his mother, Dawna Langford, told him to “get down right now” before she was fatally shot in the ambush.

“She was trying to pray to the Lord, and she was trying to start the car up to get out of there,” Devin said in the interview that aired Monday.

“They just started hitting the car first, like with a bunch, a bunch of bullets. Just start shooting rapidly at us,” he said. “It felt real scary and it felt like a lot of bullets.”

Devin was in the car with his mother and nine siblings when they were attacked by cartel members in Sonora state last Monday.

“Afterward, they got us out of the car, and they just got us on the floor and then they drove off,” he added, saying the cold-blooded assassins had long rifles and bulletproof vests.

The bloodshed left Dawna Langford and two of Devin’s brothers, Trevor Langford, 11, and Rogan Langford, 2, dead, along with six others, who were traveling in two other cars.

Some of Devin’s other siblings were also badly hurt, including his sister Kylie, who was shot in the foot, and his baby brother Brixon, who was hit in the chest.

“We walked a little while until we couldn’t carry them no more. And so we put them behind a bush,” he told ABC of hiding them with branches in case the cartel killers returned.

“I wasn’t hit or nothing. So I started walking,” Devin said of what turned into a 14-mile journey back to the family’s community of LaMora, where he notified relatives of the bloodshed.

“Every one of them were bleeding really bad. So I was trying to get in a rush to get there,” he said of his wounded kin.

He also said the hours-long journey was terrifying because he spent the whole time wondering “if there was anybody else out there trying to shoot me or following me.”

The long walk was worsened by the heartache of having to think about “my mom and my two brothers that died,” he added.

“She was a nice person and a brave woman that tried to save her kids,” said the teen, growing emotional.

Devin’s dad, David Langford, is convinced his son saved lives.

“To be honest with you, my boy’s a hero simply because he gave his life for his brothers and sisters,” he told ABC, tearing up.

“Every one of my children that survived that are living miracles.

“How many bullet holes were fired into that vehicle … at that horrific scene and how many children were involved. It’s amazing. It’s amazing. It’s beyond amazing that they survived.”

The Langfords joined dozens of others from the area’s Mormon settlements to flee Mexico for the US on Sunday following the attack.

“So now, it’s my whole life has turned upside down,” the dad told ABC. “Not only have I lost a wife and two children, but I’m having to move the rest of my family with really no place to go at this point.

“Hold onto your family — there’s nothing like family,” he said.