Two huge explosions tore through an industrial area where toxic chemicals and gas were stored in the northeast Chinese port city of Tianjin, killing at least 50 people, including at least a dozen fire fighters, state media said yesterday.

At least 700 people were injured, more than 71 seriously, the Tianjin government said on its Weibo microblog, and the official Xinhua news agency said two fires were still burning.

Wednesday night’s blasts, so large that they were seen by satellites in space, sent shockwaves through apartment blocks kilometres away in the port city of 15 million people. Internet videos showed fireballs shooting into the sky and the US Geological Survey registered the blasts as seismic events.

Vast areas of the port – the 10th largest in the world – were devastated, crumpled shipping containers were thrown around like matchsticks, hundreds of new cars were torched and port buildings left as burnt-out shells.

Burnt cars near the site of two explosions at the industrial area of Binhai new district in Tianjin, yesterday.Burnt cars near the site of two explosions at the industrial area of Binhai new district in Tianjin, yesterday.

“I was sleeping when our windows and doors suddenly shook as we heard explosions outside. I first thought it was an earthquake,” Guan Xiang, who lives seven kilometres away from the explosion site, told Reuters by telephone.

Guan, 24, said he saw flames and a mushroom cloud in the sky as he and other residents scrambled to get out of the building.

Tianjin authorities said 12 firefighters were among the 50 killed.

The cause of the blasts was being investigated but Xinhua said several containers caught fire beforehand. Industrial accidents are not uncommon in China following three decades of breakneck economic growth. The state-run Beijing News earlier cited Tianjin fire authorities as saying they had lost contact with 36 firefighters. By late afternoon, Xinhua reported 18 were missing, while 66 were among the hundreds of people being treated in nearby hospitals.

Xinhua said 1,000 firefighters and more than 140 fire engines were struggling to contain a blaze in a warehouse that held “dangerous goods”.

US Geological Survey registered the blasts as seismic events

“The volatility of the goods means the fire is especially un­predictable and dangerous to approach,” Xinhua said.

Several fire trucks had been destroyed and nearby firefighters wept as they worked to extinguish flames, the Beijing News reported.

President Xi Jinping demanded that authorities “make full effort to rescue and treat the injured and ensure the safety of people and their property”.

City officials had met recently with companies to discuss tightening safety standards on the handling of dangerous chemicals.

Anxious residents rushed to hospitals to seek news about injured loved ones but dozens of police guarded the entrance of the Teda hospital.

Pictures on Chinese media websites showed residents and workers, some bleeding, fleeing their homes. Xinhua said people had been hurt by broken glass and other flying debris. Authorities told reporters they expected the blasts to have forced 6,000 people from their homes by nightfall.

Grey clouds of smoke billowed above the blast site and several trucks carrying paramilitary police – wearing masks to protect them from potentially toxic smoke – headed to the area. The blasts shattered windows in buildings and cars and knocked down walls in a two-kilometre radius around the site. Photographs on news websites showed burned-out cars inside a multi-storey car park at a logistics base at the port.

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