Hong Kong security tightened ahead of top Chinese visit Hong Kong has launched one of its largest security operations in years, as a high-ranking Chinese politician is set to arrive in the city. Zhang Dejiang, the man responsible for Hong Kong affairs in Beijing, arrives amid concerns over the territory's freedoms and interference by China. More than six thousand police personel have been deployed and restricted zones imposed in the city centre. Pro-democracy groups say they will stage protests during the visit. Mr Zhang, is the most senior official to visit Hong Kong since 2014 when thousands of protesters took over major parts of the city to demand free elections. SOURCE: BBC news