Security cameras have been installed at the tomb of Li Ka-shing's wife in an attempt to prevent further acts of vandalism and looting. The move comes after the grave of Li Chong Yuet-ming at Hong Kong Buddhist Cemetery at Cape Collinson, Chai Wan, was prised open by suspected tomb raiders on the first day of the Lunar New Year. A total of five security cameras were spotted at the cemetery's management office building by a South China Morning Post reporter yesterday morning. Three of the cameras were fixed in a triangular formation on a wall overlooking part of the cemetery where the grave is located, one on the rooftop monitoring the inner courtyard and one above the office entrance. A notice, written in Chinese only and undated, was posted near the office entrance informing visitors that the cemetery had been fitted with 24-hour security cameras. No one was available for comment at the Hong Kong Buddhist Association, which manages the cemetery, or Cheung Kong (Holdings), the company of which Mr Li is chairman. Au Yeung-wai, the cemetery's caretaker, refused to answer queries about the security cameras. 'You should call the association about this matter as I am not free to answer it myself,' he said. Four men who spoke with mainland accents were spotted by cemetery workers vandalising the grave on January 29. The suspects - armed with knives and pistol-like objects - tied up the workers and robbed them of cash and valuables worth $70,000. No arrests have been made. Mr Li said afterwards that the robbers should not feel peace for the rest of their lives if they believed in retribution. His wife died 16 years ago, aged 58. Opened in 1963 and covering 6.54 acres, the cemetery has 3,556 coffin burial spaces, 281 urn burial spaces and 4,718 niches for human bones or ashes.