Li Hailiang, an employee at the Donghai Bridge Administration in Shanghai, said Monday that it was not immediately clear what caused the one-vehicle accident.
He said six people died on the scene and that an unspecified number of injured people were taken to a hospital.
The state broadcaster CCTV says more than 20 people were injured.
Donghai Bridge connects China’s financial metropolis Shanghai with a deep-water port in the East China Sea. With a length of 32.5 kilometers (20.2 miles), it is one of the longest cross-sea bridges in the world.
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