Gunmen killed Benjamin LeBaron and brother - in - law this week in northern Mexico . Security camera at toll booth shows death of two suspects , news report says . No suspects have been reported in the Americans ' slayings . Note reportedly found that says killings were retribution for the arrests .
Gunmen killed Benjamin LeBaron and brother-in-law this week in northern Mexico . Security camera at toll booth captured images of two suspects , news agency says . No arrests have been reported in the Americans ' slayings . Note reportedly found that says killings were retribution for drug arrests .