Fire fighters had extinguished the fire last night at a farm produce wholesale market in Pudong new district of Shanghai, the district's official said.
Rescuers have retrieved five bodies from the debris of the fire and all injured people have been hospitalized, said the microblog.
Rescuers are still searching for the casualties at the fire site, state-run Xinhua news agency reported.
Opening around the clock, the Shanghai agricultural products central wholesale market is the city's largest wholesale market for farm produce and byproducts.
The fire broke out at a time when wholesalers inside the market were busy selling products to retailers.