The blast occurred at the attic of the house at Huchting district at around 04.30 a.m, local media Focus Online quoted a police spokeswoman as saying.
A 41-year-old woman and her seven-year-old son were killed in the house, which was mostly destroyed. A 70-year-old woman living in a neighbouring house also died because of the impact.
The adjacent houses were badly damaged by the explosion. The flames were extinguished later in the day.
Within a radius of 100 metres, the police evacuated all the properties as a precautionary measure. Around 70 firefighters were on duty. The cause of the blast was unclear.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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