West Bengal Chief Minister Mamata Banerjee on Monday said that she is "saddened" after a five-storey under-construction building collapsed in South Kolkata's Metiabruz area, adding that the rescue operation is underway, reported news agency ANI.

"Sad to learn about the house collapse disaster of an under-construction building in the Garden Reach area of the Kolkata Municipal Corporation. Our Mayor, Fire Minister, Secretaries and Commissioner of Police, civic, police, fire and disaster management officers and teams (including NDRF, KMC and KP teams) have been on site throughout the night for mitigating the disaster," the West Bengal CM posted on X.