Civic Party lawmaker Tanya Chan says she cannot rule out the possibility Beijing played a hand in a break-in at her Sheung Wan office. She is preparing to resign next week, along with four other legislators, and trigger by-elections being touted as a de facto referendum on universal suffrage. Chan is the latest victim in a series of mostly unsolved attacks aimed at politicians in recent years. The case came to light after an eighth-floor resident of Tung Sing House, Lok Fu Road, called police to lodge a noise complaint at 12.08am. Police said the front door of Chan's office on the 10th floor had been removed from its fixtures and marks were found on the door. A police spokesman said an initial investigation showed no signs of ransacking inside the office and nothing had been stolen. No one was inside the office at the time of the attack. Detectives from Central police station are investigating. 'I am mystified and found nothing was missing from the office, which I seldom visit because it is a district office for the district council,' Chan said. 'My friends warned that instead of missing something, perhaps I should look for hidden bugging devices which might have been installed.' Chan said she would not rule out the possibility of Beijing being involved. She is now finalising preparations to resign from her Hong Kong Island seat and take part in the ensuing by-elections with colleagues from her party and the League of Social Democrats. Beijing has condemned the action and says it is inconsistent with the Basic Law. Chan said police had checked the party's headquarters in North Point and found no irregularities. She will install security cameras at her office. A female security guard said no one was on overnight duty in the building. She said the person entered without prising open the front door on the ground floor and probably knew surveillance cameras had been out of action for about two weeks. In recent years several politicians have received death threats or had their offices vandalised. In 2006 Democrat Albert Ho Chun-yan was assaulted in a fast-food restaurant, and last year Martin Lee Chu-ming, a former party chairman, was a target of an assassination plot.