Hours after the announcement that Zhou Yongkang was arrested, Xinhua reported that Beijing elevated the security level of its public transportation to the highest level. Anyone who refused to accept a security inspection would face penalties.
According to Xinhua, each security checkpoint at an underground subway and at suburban railways is manned with four or five security personnel. Each station has security personnel providing on-site inspections. Security inspections are conducted every 15 to 20 minutes for the key parts of the subway such as trash bins. Around the clock, every bag is subject to a security check and whenever there is any suspicion, there will be a thorough security check. Security officers are conducting security checks on passengers at the bus stations and in the bus compartments. At the long distance bus stations, the recording of incoming passengers and the searches of incoming cargos has been tightened.
Source: Xinhua, July 29, 2014
http://news.xinhuanet.com/local/2014-07/29/c_1111852903.htm