Chennai: Nine migrant labourers were killed in a major tragedy at Ennore Thermal Power Plant in Tamil Nadu’s Tiruvallur district on Tuesday.

According to preliminary reports, an arch collapsed from nearly 30 feet, trapping several migrant workers who were on duty at that time.

Four workers died instantly, while five others succumbed to injuries at the hospital.

One labourer sustained grievous injuries, while at least 10 were seriously hurt. All of them are currently undergoing treatment at Stanley Government Hospital in north Chennai.

“A tragic accident occurred at the North Chennai Thermal Power Station construction site today. Preliminary reports state one worker sustained grievous injuries, while more than 10 others are to have been seriously hurt in the collapse incident. The victims have been rushed to Stanley Government Hospital in North Chennai. The exact cause of the accident is yet to be determined. Rescue operations are ongoing, and authorities have launched an investigation into the incident,” the Avadi Police Commissionerate said in a statement.

Tamil Nadu Electricity Board Secretary Dr J Radhakrishnan visited Stanley Hospital to meet the workers who were injured in the structure collapse.