Passengers at Shenzhen International Airport on Monday. The city s frontier inspection general station processed nearly 1.8 million passengers during the three-day New Year holiday. It also handled some 10,400 tourist groups, double the figure recorded in the same period last year. A large number of mainland residents visited Hong Kong during the holiday while Hong Kong residents swarmed across the border to visit Shenzhen and other Pearl River Delta regions. Qiu Haibin