Beijing post administration shall deploy and do a good job of secondary security inspection from August 31 to September 10, supervise and guide the delivery enterprises to carry out secondary security check before delivery of all express mails entering Beijing, and paste traceable security checked signs as required. All localities should strengthen the security inspection measures for the express mails sent to Beijing, affix or paste the security inspection marks one by one, indicating the security inspection units. The postal administrations of Tianjin, Hebei, Shanxi, Inner Mongolia, Shandong and Liaoning provinces (districts and cities) should strengthen the safety supervision and law enforcement inspection of the delivery enterprises in the suburbs of Beijing and the border areas around the provinces, and strive to build a moat defense line around Beijing.
According to the official website of the State Post Office
Source: Qiao JunJing, editor in charge of Beijing News_ NBJ11279