Two peop have been charged after last month’s “cartel-style execution” of a family of six in California, including a young mother and her 10-month-old baby, authorities announced Friday.

Angel Uriarte, 35, and Noah Beard, 25, were arrested and charged each with six counts of murder in connection with the Jan. 16 shooting, Tulare County District Attorney Tim Ward said at a Friday news conference.

Both are known members of the Norteño gang, Tulare County Sheriff Mike Boudreaux said during the news conference. He said the shooting was likely the result of a conflict between the Norteños and the Sureños, a rival gang.

The suspects have “a long history of gun violence,” and are “heavily active in guns, gang violence, gun violence, and narcotics dealings,” Boudreaux said.

“This was clearly not a random act of violence,” he said. “This family was targeted by cold-blooded killers.”

Still, Boudreaux said “the motive is not exactly clear at this point.”

CALIFORNIA SHOOTING:Shooter stood over teen mother, baby and shot them ‘assassination-style’

‘Operation Nightmare’ leads to arrests

The arrests were the results of a multiagency effort called “Operation Nightmare,” according to the sheriff’s department. The effort included searching several California prisons and 10 days of surveillance of the suspects. Ultimately, forensics evidence helped authorities connect the suspects to the shooting.

Friday morning, more than 100 law enforcement officials from local and federal agencies executed search warrants at three locations to arrest the suspects.

Beard was taken into custody “without incident,” Boudreaux said. But Uriarte ran from law enforcement and fired several shots at ATF agents, who fired back, the department said. Uriarte was struck in the torso during the shootout and taken to the hospital, where he underwent surgery and is in stable condition.