A suspect has been arrested in the massacre of nine family members from a Mormon community on the Mexican side of the border with the United States, Mexican authorities said Tuesday.
The suspect was holding two bound-and-gagged hostages in the hills of Agua Prieta in Sonora state, the ministerial Agency for Criminal Investigations (AMIC) said.
The suspect had several rifles and a large amount of ammunition, including a number of large-caliber weapons, the agency said in a statement posted to its official Facebook page.
The arrest came a day after a convoy of women and children was viciously attacked by criminal groups while driving near the US-Mexico border, Mexican authorities said.
The victims and eight surviving children were ambushed by criminal groups Monday evening while traveling between the states of Sonora and Chihuahua, Mexican authorities said.
The victims appear to be from a fundamentalist sect, separate from the mainstream Church of Jesus Christ of Latter-day Saints.
Three women, four small children and two infants -- all dual US-Mexican citizens -- were killed in their vehicles Monday, family member Alex LeBaron said.
The attorney general for the neighboring state of Chihuahua, Cesar Peniche Espejel, confirmed the arrest in an interview with Mexico's Imagen Radio on Tuesday but could not confirm details of the suspect's involvement.
"We are waiting for some more intelligence in order to issue an official statement," he said.
Peniche Espejel said he believes the newly-formed Los Jaguares cartel, an offshoot of the Sinaloa cartel, may be behind the massacre.
But earlier Tuesday, a US official said a rival cartel called La L?nea is under focus.
"These very cartels of Sinaloa, after the arrest of Guzman 'El Chapo' have suffered fragmentations," Peniche Espejel said.
"They have been growing near the border with the United States and are heavily involved in trafficking of immigrants into the United States and drug-trafficking."