Investigations are still ongoing as to what caused the massive but mysterious, explosion in the town of Nussbaumen in canton Aargau.
Two people died and 11 injured after the explosion in an underground car park below an apartment block.
Aargau police say the suspect it may have been caused by fireworks.
Plastic parts found near the site point towards what’s known as F4 fireworks. These are powerful units which are used only by professional firework display companies.
They’re normally only supplied to those with licences and should be stored in buildings specifically designed.
The cantonal prosecutor’s office, which is involved in the investigation, says so far the findings point towards an accident.
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