A "major explosion" was reported Sunday night by the BBC in the English town of Leicester, causing damage to a convenience store and killing at least four people. 

Four other people remain in the hospital, and one of those four had serious injuries, according to the BBC. Rescue efforts continued Monday.

It is unknown exactly what caused the explosion but law enforcement officials told the BBC that, "At this stage there is no indication this is terrorist related."

Search and rescue teams were working to find and remove wounded victims from the explosion. 

Several roadways in the area have been closed as police converged on the area. 

Photos posted on social media show flames reaching into the sky from the explosion. The BBC reported that one of the buildings involved in Sunday's explosion had a "pancake collapse."