At least 44 people are known to have died, and more than 500 injured, following two major explosions in China’s northern port city of Tianjin.
Twelve firefighters are among those who lost their lives; 36 are still missing.
The blasts happened in a warehouse for hazardous chemicals and caused a huge fireball that could be seen from space.
Hospitals have been overwhelmed with people seeking treatment for injuries caused by flying glass and debris. Some 66 people are in a serious condition.
President Xi Jinping has promised a thorough investigation into what happened and “transparent information disclosure to the public,” Xinhua news agency reports.
The first explosion occurred at about 23:30 local time (15:30 GMT) on Wednesday in the city’s Binhai New Area, a vast industrial zone which houses car factories, aircraft assembly lines and other manufacturing and research firms.
The blast was followed seconds later by another, more powerful blast, and a series of smaller explosions.
Buildings within a 2km radius (1.5 miles) had windows blown out, office blocks were destroyed and hundreds of cars burnt-out.
The impact of the blasts could be felt several kilometres away, and was registered as seismic activity at a US Geological Survey monitoring unit in Beijing 160km (100 miles) away.
The China Earthquake Networks Centre said the magnitude of the first explosion was the equivalent of detonating three tonnes of TNT, while the second was the equivalent of 21 tonnes.