The affected workers were given three months to file criminal complaints. On Wednesday, Zurich police confirmed that several complaints had been received, without giving an exact number.
Those who live in different cantons may have filed complaints with their local police. Prosecutors will now decide whether to lay charges of criminal negligence.
The event organiser said in June that none of the participants were forced to walk over hot coals and that it had waited for coals to cool to 500 degrees, which is lower than the 700 degrees normally considered safe for the activity.
Firewalking involves walking barefoot over a bed of hot embers or stones. It is practised in many parts of the world as a rite of passage or test of strength or courage.
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