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At least one person has been killed after "17 explosions in three minutes" rocked the Chinese city of Changchun.
Dramatic footage shows terrified people running for their lives during the blasts, with smoke rising through the streets.
Witnesses report hearing several bangs in what is initially suspected to have been a terror attack.
Chinese authorities claimed two explosions, one in a car park and one on the 30th floor of a building, happened just three minutes apart.
But New York Times reporter Austin Ramzy claimed the 17 blasts came when objects were thrown from a building above.
He tweeted a new video showing explosives falling from the building and detonating as onlookers flee.