SHANGHAI - Two workers died and four others were injured when a scaffold collapsed at a construction site in Shanghai's Pudong New District on Thursday, local safety authorities said.

The accident happened at 11:30 am at a construction site for a new urban railway route near Luoshan Road, the Shanghai Work Safety Administration said in a press release.

It said all the six workers were working on the scaffold when it collapsed.

The four injured are being treated for fractures at a local hospital. Their injuries are not life-threatening, the press release said.

The cause of the accident is being investigated.