A fire broke out at four warehouses of Chinese e-commerce giant JD.com in north China’s Hebei Province early Sunday morning.

According to the company, the warehouses in Gu’an County, near Beijing, stored food and products for everyday use, and there were no flammable or explosive materials when the fire started at about 4 a.m.

The fire has been put under control by local firefighters and did not cause any casualties. An estimate of the burned area and an investigation into the cause of the fire are under way.

Public information shows that the warehouses were part of JD.com’s largest and most advanced logistics park, which covers customers in Beijing and Tianjin as well as some northern and eastern provinces. More than 10 million types of products are currently stored in the park.