Beijing: At least four people were killed and 33 others injured in an explosion at a gas supply company in east China.

The blast occurred on Tuesday at Boxing Chengli Gas Supply Co Ltd in Shandong province, local officials told state-run Xinhua news agency.

The victims include three employees from the company and a construction worker.

Four employees of the company and nine other construction workers were injured in the explosion while 20 people staying near the site also suffered minor injuries.