Police recovered gas canisters and World War I ammunition from one of the flats.
One man was killed and 25 more were injured on Friday morning when an explosion ripped through a residential building in the German city of Blankenburg, police said.
Authorities said the victim is a 78-year-old resident of the building and that the explosion had likely been caused by liquid gas found in his flat. Several gas canisters and World War I ammunition were recovered from his dwelling, police said.
A bomb disposal unit has been dispatched to assist with the investigation, it added on Twitter.
The explosion took place at 08:55 CET in an apartment building in Blankenburg, central Germany. The building, as well as a daycare centre next to it, were evacuated.