SHANGHAI - Five workers were killed and 18 others injured after a concrete platform under construction collapsed in Shanghai, a municipal government source said on Tuesday.

The accident occurred at around 9 p.m. Monday in a building in the Pudong New Area for examination and repair, which was part of the Jinqiao parking lot for Shanghai's No.12 subway line, the source said.

One was killed at the scene. The four others died in hospital.

The cause of the incident was under investigation.