Hong Kong police say they have begun an investigation into the booing of China’s national anthem in a shopping mall that was showing a live broadcast of the territory’s first Olympic gold in 25 years. Hundreds of people gathered briefly on Monday night in a shopping mall to watch Cheung Ka Long claim the Olympic men’s individual fencing title. Police said on Friday they fielded complaints that some people booed during the award ceremony when China’s national anthem was played, according to local media. At the subsequent medal ceremony, some fans initially booed China’s national anthem and then chanted “We are Hong Kong” in scenes that were broadcast live.