A RING of armed security has been thrown around Chief Secretary Anson Chan Fang On-sang after she received death threats. Officers from the VIP Protection Unit have escorted Mrs Chan since the threats were issued at least a week ago. They are also understood to be guarding the Chief Justice, Sir Ti Liang Yang. 'There has been a threat and we are taking it seriously,' a senior government source said yesterday. 'Every day the officers pick her up from her residence and escort her to the Central Government Offices in her own 'CS' car.' The threats are believed to be linked to a hate campaign sparked by the jailing of a loanshark. At least three to four officers from the VIP Protection Unit were with Mrs Chan at all times, the source said. There is regular security at Mrs Chan's official residence, based on advice from the Crime Prevention Bureau, but she does not usually have bodyguards. A government spokesman said security for Governor Chris Patten usually handled by a 24-hour personal detail, was operating as usual. 'I wouldn't want to comment on a matter with security implications,' Mr Patten said yesterday. 'The sensible thing for us to do is to make sure we continue with security in public and private life in Hong Kong and we take all the measures necessary to ensure that nothing can happen.' A Judiciary spokesman said Sir Ti Liang was guarded by an armed police officer but refused to comment on additional security. Mrs Chan yesterday toured the Caroline Hill Road compound of the Electrical and Mechanical Services Department in Causeway Bay, but brushed off questions concerning her security or the death threat. But she added she would be 'very careful'. Her Jaguar pulled into the compound just before 2.30 pm followed by a white Toyota Corolla with civilian registration plates. Mrs Chan emerged with her two aides, plus a broad-built man dressed in a dark suit carrying a walkie-talkie. The man accompanied her during the two-hour inspection tour, not falling more than two metres behind her despite the bustling press. Two other men and a woman, also sporting radio headgear, got out of the white car and patrolled the tour area. Head of the Crime Prevention Bureau Superintendent Graham Lander said all secretariat personnel living in official residences received home security advice from the bureau. 'All official residences are given a security level commensurate with their use,' Mr Lander said. 'There has been a certain amount of upgrading on Government official residences. That is part of an ongoing programme at the moment.' Former Special Duties Unit head Colin Hill said VIP Protection Unit officers were 'some of the best trained in the world'. They had trained with the British military and also worked in the UK with the Diplomatic Protection Unit and the Royalty Protection Unit. A team protecting the Chief Secretary would be required to select routes, search and secure buildings before she arrived.