NEW : There may be drug dealers retaliating several recent arrests , police say . Six police officers , one civilian killed Friday in noon shootout in Ciudad Juarez , Mexico . Five of the dead were federal police officers , one was a female city officer , police says . Six officers , one civilian wounded .
NEW : Gunmen may be drug dealers retaliating several recent arrests , police say . Six police officers , one civilian killed Friday in noon shootout in Ciudad Juarez , Mexico . Five of the dead were federal police officers , one was a female city officer , mayor says . Two officers , one civilian wounded .