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What caused the Tianjin blasts? China authorities hunt for clues.

Investigators continue to search for answers to what caused two warehouse explosions that killed at least 50 and wounded about 700 at a port in Tianjin, China. 

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    Fire fighters in protective gear watch partially pink smoke continue to billow after an explosion at a warehouse in northeastern China's Tianjin municipality, Thursday, Aug. 13, 2015. Huge, fiery blasts at a warehouse for hazardous chemicals killed many people and turned nearby buildings into skeletal shells in the Chinese port of Tianjin, raising questions Thursday about whether the materials had been properly stored.
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Investigators searched for clues on Friday to identify what caused two huge explosions at a warehouse used to store toxic chemicals and gas at a busy port in northeast China, as foreign and local companies assessed the damage to their operations.

The blasts in the city of Tianjin on Wednesday night killed at least 50 people, including a dozen fire fighters, state media said. About 700 people were injured, 71 seriously.

The explosions at the port, the world's 10th largest, were so big they were seen by satellites in space and registered on earthquake sensors.

The warehouse was designed to store dangerous and toxic chemicals, according to an assessment by environmental inspectors published in 2014. It was storing mainly ammonium nitrate, potassium nitrate and calcium carbide at the time of the blasts, according to the police.

A team from the International Atomic Energy Agency's Beijing environmental emergency response center, as well as 214 Chinese military nuclear and biochemical materials specialists, had gone to Tianjin, the official Xinhua news agency said.

Several thousand residents were moved to 10 nearby schools after apartment buildings and homes were damaged, mainly by shockwaves from the explosions, it said. Two fires were still burning late on Thursday.

Vast areas of the port were devastated, crumpled shipping containers were thrown around like match sticks, thousands of new cars were torched and port buildings reduced to burnt-out shells, Reuters witnesses said.

Foreign companies from across the globe were trying to determine the damage to their facilities in and around the port, a gateway to northeast China.

The Nikkei newspaper said windows were broken at Toyota Motor Corp's passenger vehicle assembly plant but no one was hurt. It said numerous other Japanese companies sustained minor damage to their operations.

French carmaker Renault said more than 1,000 of its cars were damaged but no staff were hurt. Around 4,000 cars belonging to Hyundai Motor Co were at the site but damage had not yet been assessed, a spokesman said.

Mining giant BHP Billiton said its port operations and shipments were disrupted but its iron ore discharging berth had not been damaged.

Oil tanker arrivals and departures were also disrupted.

John Deere & Co, the U.S. farm and construction equipment maker, said several workers who were at home at the time were injured, some critically.

Packaging 'sub-standard'

Xinhua identified the owner of the warehouse as Tianjin Dongjiang Port Ruihai International Logistics. The state-backed China Daily newspaper said its manager had been detained.

The Tianjin Maritime Safety Administration said the company violated packaging standards during a safety inspection two years ago.

Of 4,325 containers that were checked, five failed the inspection because packaging was sub-standard, according to a report posted on the administration's website in January 2014.

The company's website said it was a government-approved firm specializing in handling "dangerous goods." Phone numbers listed on its website were disconnected and an email to the company went unanswered.

President Xi Jinping said those responsible should be "severely handled."

Tianjin city officials had met recently with companies to discuss tightening safety standards on the handling of dangerous chemicals, authorities said.

Industrial accidents are not uncommon in China following three decades of breakneck economic growth. A blast at an auto parts factory in eastern China killed 75 people a year ago when a room filled with metal dust exploded.

Wednesday's blasts, which came roughly 30 seconds apart, sent shockwaves through apartment blocks kilometers away in the port city of 15 million people. Internet videos showed fireballs shooting into the sky.

Xinhua said several containers had caught fire beforehand.

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.

Anxious residents rushed to hospitals to seek news about injured loved ones. Dozens of police guarded the entrance of the TEDA hospital, a Reuters witness said.

The blasts shattered windows in buildings and cars and knocked down walls in a 2-km radius around the site.

(Additional reporting by Joseph Campbell in TIANJIN, Kazunori Takada, Chen Yixin, Brenda Goh and Sue-Lin Wong in SHANGHAI, Michael Martina, Jason Subler, Megha Rajagopalan and Judy Hua in BEIJING and Meredith Davis in CHICAGO; Writing by Dean Yates; Editing by Raju Gopalakrishnan and Paul Tait)

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