Suspect is alleged leader network believed to be smuggling guns into U.S. . Last week , 42 Mexican troops were sent to the U.S. Bureau of Alcohol , Tobacco , Firearms and , Mexico , to quell violence . Mexican drug cartels blamed for killings of police officers . `` It 's called 'mata policias , ' or 'cop killer . ' ATF : Mexico authorities sharing intelligence with their Mexican counterparts .
Suspect is alleged leader network believed to be smuggling guns into U.S. . Last week , 42 Mexican troops were sent to the U.S. Bureau of Alcohol , Tobacco , Firearms and , Mexico , to quell violence . Mexican drug cartels blamed for killings of police officers . ATF : Mexico authorities sharing intelligence with their Mexican counterparts .