Four severely injured people were rescued from the house after the blast.
An explosion has injured 25, four seriously, and destroyed a building in the German city of Wuppertal.
Neighbours ran out into the street in a panic after the house was rocked by the blast shortly before midnight on Saturday.
Fire broke out as the house collapsed, leaving a gaping hole in the row of apartments and debris piled in the street and on top of a nearby car.
Four severely injured people were rescued and another 21 people were treated for injuries by emergency staff at the scene in the Langerfeld district.
Police said they were investigating the cause of the explosion and would not comment when asked if the explosion could possibly be terror-related.