Police suspect that some laborers are trapped under the rubble where around 100 of them were working at the time of the mishap.
"The incident occurred at the upcoming Judicial Officers Training Institute building being built on the Chhattisgarh High Court premises, around 10 kms away from here towards Raipur," said Bilaspur Superintendent of Police Abhishek Pathak.
Around 100 laborers were working at the site when the portion of slab which was being laid caved in at around 4 PM, he said, adding that a team of police personnel was immediately rushed to the spot.
Later, two other laborers who were trapped under the debris were evacuated and admitted to Apollo Hospital where one of them succumbed to his injuries during treatment, the SP said, adding that the condition of another laborer is critical.
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The deceased has been identified as Toman Porte (23), a native of Akaltara town in neighboring Janjgir-Champa district.
"There is a chance that some people might have been trapped under the rubble. Search and rescue operations are going on at the spot," the SP said.
The cause behind the mishap is still ascertained, he added.