The South China Morning Post reports that China has edged out the United States as the world’s prime source of internet-related security threats, according to a report by cyber security software provider Symantec Corp. More than 23 per cent of global threat incidents came from the mainland last year, up from around 10 per cent the year before, said its Internet Security Threat Report released this week. The sharp growth of zombie computers, systems taken control by hackers, spurred the overall increase, the company said. Theses zombie computers in China launch cyber attacks without the owners knowing, but the criminals behind them can be from anywhere in the world.