Residents rush to leave after getting an evacuation order near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Shen Bohan) 

Staff members cry to call back residents who go upstairs to fetch their personal materials after getting an evacuation order outside a residential building near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Shen Bohan) 

Cars carrying residents rush to leave after getting an evacuation order near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Shen Bohan) 

Residents rush to leave after getting an evacuation order near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Zheng Huansong) 

Residents rush to leave after getting an evacuation order near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Shen Bohan) 

Residents rush to leave after getting an evacuation order near the core area of explosion site in Tianjin, north China, Aug. 15, 2015. All people within 3-km radius are required to evacuate from Tianjin blasts site. (Xinhua/Shen Bohan)