Ground Zero of the explosion in Guangzhou. (Guangzhou Daily)

At least 7 people were killed and 36 injured in an explosion in Guangzhou South Cha Thursday, local officials said.

The blast occurred around 3:40 p.m. when workers were transferring goods from a parked truck to another in Hongkangdongzhu estate in Guangzhou, the capital city of Guangdong Province, officials and witnesses said.

All the injured, two of whom were serious, were rushed to a nearby hospital.

The explosion also caused a fire that was extinguished after more than two hours.

The cause of the blast was not yet known and investigation was underway.

Ground Zero of the explosion in Guangzhou. (Guangzhou Daily)