As the temple festival was on, fireworks display had commenced at the temple precincts since midnight and hundreds of people had gathered to watch the show.
As the fireworks and pyrotechnics display was coming to a close at 3 AM, an explosion is suspected to have occurred at the storeroom 'Kambapuram' filled with crackers and pyrotechnics materials, police said.
Men, women and police officials are among the dead, they said.
Nearly 200 people got injured in the mishap and have
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been admitted to various hospitals in the district and nearby Thiruvananthapuram, police said.
State Health Minister V S Sivakumar said directives have been issued to hospital authorities to make necessary arrangements for the injured.
State Home Minister Ramesh Chennithala said Director General of Police (DGP) Senkumar is monitoring the rescue operations.
"A comprehensive probe will be conducted into the incident. Adequate compensation would be given to the victims of the accident after consulting with the Election Commission," Chennithala said.
Local media reports quoting Kollam district authorities say the temple authorities ignored warnings issued against holding a huge firework in the area vulnerable to such accident.
Eye witnesses told television channels that the accident took place at 3.30 am.
The sound of the explosion in the store-room was heard in around two-km radius of the temple, they said.