01 July 2014 02:19 GMT
State broadcaster CCTV reported that the spilt oil was burning fiercely and emergency services were trying to put out the flames in order to prevent an explosion, according to Reuters.
Xinhua news agency said the burst, near Dalian University, was caused by construction work, and the oil had ignited in at least one location. It said there were currently no casualties.
Xinhua said the pipeline belonged to China National Petroleum Corporation, the controlling shareholder of PetroChina.
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