Prosecutor Sandra Luecke told the dpa news agency on Saturday that the suspect, whose identity wasn't released, was so badly injured in the explosion that authorities have not yet been able to question him.
It's not yet clear what caused the Friday morning explosion, although Luecke says there were indications it was gas. The force of the blast blew the roof and the two top floors off of the house, and damaged adjacent buildings and vehicles on the street.
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