CHINA'S police chief, Mr Tao Siju, admitted that organised crime syndicates remained active in some areas of China. Despite a massive crackdown on crime, the Public Secretary Minister said some gangs had been engaged in crimes such as stealing weapons. ''They are highly mobilised and frequently move their bases from one place to another. This causes great difficulty in eradicating them,'' he said. Mr Tao is an observer at the current National People's Congress. Premier Mr Li Peng said in his government work report that the problem of law and order in some places had been ''extremely serious''. Mr Tao noted that the looting of weapons had been serious in some counties in Guangdong. He did not name the counties. ''The problem has also occurred in Guangzhou. But there has been a swift crackdown,'' he said. The minister said the flow of weapons via borders with neighbouring countries remained a major concern to China. Mr Tao said the problem could only be solved with international co-operation. ''The problem of weapons left over after war existed in many places, such as the Middle East. International effort is necessary if it is to be solved fundamentally.'' On joint efforts with Hongkong to fight crime, Mr Tao said that co-operation would in no way be affected, even though London and Beijing were locked in a political dispute over Hongkong's democratic development. ''The question of law and order hinges on the life and property of Hongkong compatriots. We will still have co-operation, no matter how bad our relations are,'' he said.