Police officers have been told to declare their interests outside Hong Kong after the ICAC revealed law enforcement staff were working with gangsters across the border, it emerged yesterday. But the Deputy Commissioner of Police, Tsang Yam-pui, said yesterday it could be a breach of the Bill of Rights if all police officers were required to declare their interests overseas. The head of the Independent Commission Against Corruption, Michael Leung Man-kin, said this month that civil servants, particularly law enforcement officers, should make public their business interests in China. Police management had carried out inquiries into officers who had professional links with the mainland, and asked about 20 to give details of business interests. Mr Tsang said: 'The force has submitted a report to the Civil Service Branch. 'We have discovered that only certain officers who make frequent contacts overseas and carry out sensitive work have to declare their interest overseas, not only in China. 'If all police officers are required to declare their interests, it may be a breach of the Bill of Rights,' Mr Tsang said. Mr Leung has said reports showed triads were being used as go-betweens by officers on both sides of the border, and that problems often arose as a result of Hong Kong officers owning property in China. The number of reports to the ICAC of cross-border crimes rose from 55 in the first six months of last year to 77 in the same period this year. The ICAC began requiring its officers to declare interests in China this year.