Chinese President Xi Jinping arrived Thursday in Hong Kong amid tight security to attend ceremonies marking the 20th anniversary of the handover, and the inauguration of a new leader.Xi arrived at around noon at Chek Lap Kok Airport aboard a presidential plane, on his first visit to Hong Kong since becoming president in March 2013. Xi last visited Hong Kong nine years ago as vice president.For the three-day visit, police raised security measures to antiterrorist level, and a mobile security zone will follow Xi's entourage wherever he travels.Hundreds of 2-meter-high water-filled plastic bar…READ FULL ARTICLE