A powerful blast near Shanghai in China has let "many injured" and buildings flatttened.
The explosion happened at around 9am on Sunday local time in Jiangbei district in Ningbo.
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According to state news agency Xinhua, witnesses and local authorities said a factory was the source of the blast.
In a separate report, China Central Television (CCTV) did not refer to a factory, but said the force of the explosion shattered windows and punched holes in the walls of buildings as much as a kilometre away.
CCTV images showed a few flattened cars and a low-rise building with a collapsed wall.
The state broadcaster said it was not a gas explosion, without elaborating further.
According to Zhejiang Daily, several buildings collapsed in a nearby residential area that had already been cleared of people.
Police told Reuters the area had been marked for demolition.
Rescue work and investigation into the cause were underway, police said in a statement issued on its verified Weibo account.
Blasts and other accidents are common in China due to patchy enforcement of safety rules, although the government has pledged to improve checks to stamp out such incidents.