Rescue vehicles are seen at the accident site in Hangzhou, capital of East China's Zhejiang province, July 21, 2017. Two people have been confirmed dead and 55 others were injured after a blast occurred in a shop near the West Lake in Hangzhou Friday morning, according to sources with local authorities. [Photo/Xinhua]

A passenger on the bus and a passer-by were killed in the explosion, the district government said.

The injured were sent to six hospitals for treatment. Among the injured, seven people sustained severe injuries, and nine slightly injured have left hospital.

The reason for the blast is still under investigation, but it is suspected that the blast is related to a gas leak, the district government said.