One person was killed and at least 11 were injured in an explosion Friday at a residential building in the German city of Blankenburg, authorities confirmed on Friday.

The mayor of Blankenburg Heiko Breithaupt told reporters at a press conference that 11 people had been injured, despite earlier police estimates putting the figure at around 25.

One of those was seriously hurt, while nine had escaped with light injuries and another had sustained heavier injuries, Breithaupt said.

The mayor added that the building was now a "scene of devastation".