The explosion happened as workers were trying to repair leaks in the underground pipeline according to local authorities who say oil spilled into the port, which also caught fire.
Fridays blasts in the port city of Qingdao ripped slabs off pavements, overturned vehicles and shattered windows in nearby buildings.
The blasts are likely to add to growing concerns among the members of the Chinese public about the safety and environmental risks that come with oil pipeline projects.
It is one of Chinas worst industrial accidents this year.
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