Revuelta was leaving his office at 5:15 p.m. in the state capital , Morelia , when the shooting occurred , Adame said . NEW : Ciudad Juarez mayor says authorities believe drug gang attacked rehab center . Slayings add to grim statistics for Juarez , ranked deadliest city in the world . The Associated Press contributed to this report. Mexico has seen wave of violence since president declared war on drug cartels .
NEW : Ciudad Juarez mayor says authorities believe drug gang attacked rehab center . Slayings add to grim statistics for Juarez , ranked deadliest city in the world . The Associated Press contributed to this report. Mexico has seen wave of violence since president declared war on drug cartels .