A Guangdong bank will spend more than 40 million yuan (HK$37 million) upgrading security after one of its guards was arrested over a robbery in which four people were killed. Security cameras will now be installed in all 130 of the Zhongshan Industrial and Commercial Bank's branches and 30 armoured vans will be used to move cash around. Bullet-proof glass will also be installed. The new measures came after security guard Liao Yongxiong was accused of robbing his own bank on Monday last week. He took off with 140,000 yuan and HK$80,000 to pay gambling debts, police said. Liao allegedly confessed to killing three bank clerks and the driver of a taxi hijacked to rob the bank. The Guangzhou Daily said yesterday management of the bank was shocked by the brutal robbery and decided to seek expert advice to upgrade security. The bank will also stop hiring any staff if they are found to be frequent patrons of gambling dens or prostitutes or if they are discovered to be drug addicts. Staff who are found to have outside business interests or invested heavily in the stock market would be fired, the newspaper said. Security guards at branches which keep no deposited money overnight will not be issued firearms.