GUIYANG, March 14 (Xinhua) -- The death toll from a partial collapse of an unfinished building Sunday in southwest China's Guizhou Province has risen to seven, the rescue headquarters said.

A mold supporting structure in the corridor between two halls at the International Conference and Exhibition Center under construction in Guiyang, capital of Guizhou, collapsed at around 11:30 a.m., burying workers working at the area, said a spokesman for the rescue headquarters.

Rescuers found 26 workers who were rushed to hospital. Seven of the workers were proclaimed dead shortly upon arrival at hospital, one more seriously injured.

Altogether seven remained hospitalized, and another 12 were discharged from hospital after some treatment.

The police were investigating the cause of the accident.