The explosion took place early today at a cafeteria in Phoenix Town community of Shuangcheng city, a city government official said.
Thirteen people were injured, two of them were in critical condition and transferred to a hospital in the provincial capital Harbin, state-run Xinhua news agency quoted the official as saying.
In all 39 people went to an emergency medical centre for health checks following the blast, the report said.
The cause of the explosion is not known yet, the report said.
