More heads may roll Dongguan Police Chief Yan Xiaokang was fired Friday for " dereliction of duty" and seven other local officials were also removed from their positions, reported the state news agency Xinhua. More heads may roll as the Ministry of Public Security, China's national police force, warned Sunday that it will target the organizers, operators and the " protective umbrella" of the city's sex trade, referring to local police officers. What does "roll"here mean? Be fired or punished?