The incident occured during the Madathilvaravu panchavadyam ceremony of the Thiruvambadi Devaswom.
The festival known for drawing huge crowds to the cultural capital of Kerala Thrissur will be a low-key affair this year due to the pandemic.
Paramekkavu and Thiruvambady Devaswoms - the two major organisers of Pooram festival - agreed to organise the festival without spectators.
The usual flurry of crackers going up into the air, lighting up the Thrissur skyline with bright colours and deafening sound, would be sorely missed at today's 'sample vedikettu'.
The decision follows days-long talks over how to conduct the festival, which thousands of people attend, at a time when the second wave of the COVID-19 has struck the state badly.
The top bureaucrat convened another round of talks as the talks on Sunday remained inconclusive.
The safety agency has also given its permission to hold the sample fireworks before the main event.
Severe restrictions will be in force at the Thekkinkadu Ground and Swaraj Round venues.
The district Collector has written to the Chief Secretary to issue directions to hold the annual festival by referring to the government decision.
The Paramekkavu and Thiruvambady Devaswoms had earlier informed the Thrissur District Collector that the Pooram would be restricted to just rituals if only online ticketing is allowed.