NEW : Gang targets police station where Arnoldo José ` was being held . The threat was made in a note found on the windshield of a slain officer 's car , news reports said . Attacks were reprisals for capture of member of Notimex news agency gang . Series of coordinated attacks in 2 cities kills at least eight federal officers , at least eight soldiers . Officials call the coordinated attacks an unprecedented onslaught by drug gangs .
NEW : Gang targets police station where Arnoldo José ` was being held . Attacks were reprisals for capture of member of Notimex news agency gang . Series of coordinated attacks in 2 cities kills at least eight federal officers , at least eight soldiers . Officials call the coordinated attacks an unprecedented onslaught by drug gangs .