Possible suspect arrested in highway massacre case, Mexican investigators say

The suspect was found in the town of Agua Prieta, near the border with Arizona, authorities said.

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By Patrick Smith and Associated Press

Investigators have arrested a suspect in the killing of nine American citizens, three women and six children, in the Mexican border state of Sonora.

The Agency for Criminal Investigation in the state of Sonora said in a statement on its Facebook page Tuesday that officers found the suspect — whose name and sex has not been released — with two hostages in the town of Agua Prieta, near the border with Arizona.

"A person was arrested in possession of two .223 long guns, a .308 long gun, ten .223 caliber magazines, a .308 full magazine and a 50-gauge Barrett long rifle," the agency's statement said. "We are investigating the possibility that the person who was arrested had participated in these terrible events."

Investigators also found several vehicles including a bulletproof SUV.

No information has yet been released on the two hostages, who were both found gagged and tied up in a pickup truck.

Relatives of the massacre victims told NBC News that a motorcade consisting of several families was attacked Monday, with three cars getting shot at and another set on fire. They also confirmed eight children, ranging in age from 7 months old to early teens, survived.