"There are four confirmed fatalities at this stage and a number of people still undergoing treatment in hospital," Leicestershire Police Superintendent Shane O'Neill said. "We believe there may be people who have not yet been accounted for and rescue efforts continue in order to locate any further casualties," O'Neill said.
UK police respond to 'major incident' in Leicester
The blast ripped through the building on Sunday night, destroying a shop on the ground floor and a two-storey apartment above it. There was no immediate indication that the explosion was linked to terrorism, police said.
Pictures and videos showed flames leaping into the sky from the site which was reduced to rubble.
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