According to the Telegraph, Leicestershire Police declared the explosion a "major incident" as emergency responders, including six fire engines, rushed to the scene.
The injured were taken to a nearby hospital, where the condition of one person is critical.
However, the reason behind the explosion is unknown.
"The report was made just after 7 pm this evening and a number of neighbouring buildings in Hinckley Road were also damaged as a result. Leicestershire Fire and Rescue Service are dealing with the incident and Hinckley Road between Mostyn Street and Carlisle Street has been closed off.," the Spokesperson added. (ANI)