They were building a portico in a private school when a portion of it collapsed.

One killed and 12 injured after under-construction school collapses in VelloreScreenshot from YouTube/Thanthi TV
news Accident Thursday, April 13, 2017 - 19:35
One person was killed and 12 others injured after a portion of an under-construction building collapsed in Vellore district.

The incident occured at the Pincushion Montessori International school in Koranthangal area of Vellore district. According to officials who were present at the site, close to 20 workers were at the location when the accident happened. A 45-year-old worker Bhagyaraj, died after being struck by the debris while 12 others were trapped under it. The incident occurred at 4.15 pm in the evening. 
"All the workers who were trapped have been rescued from the site and sent to government and private hospitals. The area has been cleared as of now," says Ajay Sreenivasan, Revenue Divisional officer of Vellore. "They were building a portico in this private school when a portion of it collapsed. We will be looking into the matter further," he adds
When asked what could have been the reason for the accident, the RDO says, "The soil at the site seems to be loose and the basement also was not strong. An engineer will not need to study this further to come to a conclusion."
Three fire engines and six ambulances were rushed to the spot for rescue work, following the accident. 
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