Photo taken on Aug. 13, 2015 shows the burning scene of the explosion site in the Binhai New Area in north China's Tianjin Municipality. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

A building is damaged at the explosion in the Binhai New Area in north China's Tianjin Municipality, Aug. 13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

Photo taken on Aug. 13, 2015 shows smog at the explosion site in the Binhai New Area in north China's Tianjin Municipality. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

A car is damaged in the explosion in the Binhai New Area in north China's Tianjin Municipality, Aug.13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

Buildings are damaged near the explosion site in the Binhai New Area in north China's Tianjin Municipality, Aug.13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

People watch the fire at the explosion site in the Binhai New Area in north China's Tianjin Municipality, Aug.13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

Photo taken on Aug. 13, 2015 shows the burning scene of the explosion site in the Binhai New Area in north China's Tianjin Municipality. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

A fire fighter puts out fire on cars affected by the explosion in the Binhai New Area in north China's Tianjin Municipality, Aug. 13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua)

Trucks pass a bridge near the explosion site in the Binhai New Area in north China's Tianjin Municipality, Aug. 13, 2015. The death toll from a Tianjin warehouse blast Wednesday night has climbed to 17, according to rescuers. Another 32 people were critically injured and 283 people are under observation in hospital. (Xinhua/Yue Yuewei)

Smoke and fire are seen after an explosion in the Binhai New Area in north China's Tianjin Municipality on Aug. 13, 2015. An explosion rocked the Binhai New Area in north China's Tianjin Municipality at around 11:30 p.m. Wednesday. The cause and casualties are not immediately known. (Xinhua/Yue Yuewei)

Smoke and fire are seen after an explosion in the Binhai New Area in north China's Tianjin Municipality on Aug. 13, 2015. An explosion rocked the Binhai New Area in north China's Tianjin Municipality at around 11:30 p.m. Wednesday. The cause and casualties are not immediately known. (Xinhua/Yue Yuewei)

Smoke and fire are seen after an explosion in the Binhai New Area in north China's Tianjin Municipality on Aug. 13, 2015. An explosion rocked the Binhai New Area in north China's Tianjin Municipality at around 11:30 p.m. Wednesday. The cause and casualties are not immediately known. (Xinhua/Yue Yuewei)