a relative of the victim says they were traveling together in a caravan from sonora to chihuahua because they thought it would be safer that way if they traveled in groups. instead, as the mexican authorities unveiled this morning, they believe a cartel mistook them and fired on their cars. you see the burnt-out cars, bullet-riddled. what doesn't make sense is relatives of family members say children were being gunned down as they ran away, cars set on fire. would it not be apparent at that point when you see kids bolting from vehicles that it is not a drug cartel? that is the open-ended question right now as authorities investigate this. we were told they were going for the day to go shopping and see relatives between sonora and chihuahua. these groups, these families, have lived south of the border for decades. they're u.s. citizens, some of them with mexican citizenship as