Aerial photo taken on Aug. 27, 2020 shows police officers conducting examination to school buses of Tianhe primary school in Gaocheng District of Shijiazhuang, north China's Hebei Province. Gaocheng District of Shijiazhuang organized police officers to carry out safety and performance checks of all school buses within the district, as a way to prepare for the new term and ensure the transportation safety of students. (Xinhua/Luo Xuefeng)

A policeman checks the tires of a school bus of Tianhe primary school in Gaocheng District of Shijiazhuang, north China's Hebei Province, Aug. 27, 2020. Gaocheng District of Shijiazhuang organized police officers to carry out safety and performance checks of all school buses within the district, as a way to prepare for the new term and ensure the transportation safety of students. (Xinhua/Luo Xuefeng)

A policeman checks the signs on the exterior of school buses of Tianhe primary school in Gaocheng District of Shijiazhuang, north China's Hebei Province, Aug. 27, 2020. Gaocheng District of Shijiazhuang organized police officers to carry out safety and performance checks of all school buses within the district, as a way to prepare for the new term and ensure the transportation safety of students. (Xinhua/Luo Xuefeng)

Police officers check a fire extinguisher fitted on a school bus of Tianhe primary school in Gaocheng District of Shijiazhuang, north China's Hebei Province, Aug. 27, 2020. Gaocheng District of Shijiazhuang organized police officers to carry out safety and performance checks of all school buses within the district, as a way to prepare for the new term and ensure the transportation safety of students. (Xinhua/Luo Xuefeng)