A construction material company's storage structure collapsed on Friday morning in Jinzhong City in north China's Shanxi Province, trapping seven workers.

As of midday Friday, five were rescued and sent to hospital. Among them four are in stable condition, local authorities said, adding they are still trying to locate the other two missing workers.

According to China Media Group reporter on-site, the collapsed unit is storing fuel ashes for the company, which sits in a village in Xiuwen Town in Jinzong's Yuci District.