Chief Minister Yogi Adityanath expressed his condolences over the deaths and announced Rs 2 lakh compensation for the family of those killed and Rs 50,000 for the grievously injured, an official said.
"Four deaths have been confirmed by the district administration. The toll might go up," ADG (Law and Order) Anand Kumar said.
He said around 40-50 people received burn injuries, and the condition of some of them was serious. All of them were being rushed to hospitals for treatment, he added.
ADG Kumar said that all available ambulances were pressed into action and the additional district magistrate and the additional superintendent of police were on the spot to supervise relief and rescue operations.
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SP Shivhari Meena told PTI that as per initial reports "50-60 persons suffered injuries" due to the explosion.
Chief Minister Adityanath, who was away in Mauritius on a three-day official visit, ordered that necessary steps be taken for rescue and relief.
The CM has taken cognisance of the Unchahar accident and has directed principal secretary (home) to ensure that all steps are taken for rescue and relief, principal secretary (information) Awanish Awasthi, who is accompanying Adityanath, said.
Meena said that relief and rescue operations were launched immediately and the injured were being rushed to nearby hospitals.
A National Disaster Response Force (NDRF) team was also despatched to the explosion site from Lucknow for relief and rescue operations, an official said.
The explosion triggered panic among the employees who ran helter-skelter.
The district administration rushed ambulances to the spot and directed health officials to provide prompt treatment to the injured.
The NTPC's senior management is rushing to the site to coordinate the efforts, the statement added.