Beijing, Shanghai transit security tightened after Moscow bombing

Beijing and Shanghai have tightened security in the cities' metro systems, in the wake of the double suicide bombings in the Moscow subway.

A policewoman patrols a subway station with police dog in Beijing, capital  of China, on March 30, 2010. Fu Zhenghua, director of the Beijing Public  Security Bureau, confirmed the security in the capital city had been  increased after the double suicide bombing in Moscow's subway Monday. (Xinhua/Shi Sisi)

Beijing public security officers say police patrols aided by sniffer dogs are being increased at metro stations. Police will make more frequent inspections and question suspicious passengers. Beijing has maintained tight security on its public transport since the 2008 Olympics. In Shanghai, security has also been raised ahead of the upcoming World Expo.

Officials say 10-thousand police and dozens of sniffer dogs have been deployed to monitor the city's metro system. The Shanghai metro, which handles about 5 million passengers a day, is expected to see a rise in numbers of around 800-thousand, once the World Expo starts on May 1st.