Five persons -- four labourers and their contractor -- were killed after the roof of an under-construction cottage at a resort collapsed in Indore district amid heavy rains, a police official said on Friday.

The incident occurred at Choral village in Mhow tehsil, about 40km from the district headquarters, on Thursday night when four labourers and their contractor were sleeping under the freshly laid concrete slab, which suddenly came crashing down, trapping them, he said.

Two of the deceased were brothers.

Police were informed about the roof collapse at around 6.30 am and they immediately rushed to the spot and started a rescue operation, Indore (Rural) Superintendent of Police Hitika Wasal told PTI over the phone from the construction site which is surrounded by forests and hillocks.

The operation ended with the recovery of five bodies, which were sent to a hospital, she said, adding "We have launched an investigation into the incident." The accident came to light in the morning when other labourers turned up for work at the site, said inspector Amit Kumar of the Simrol police station.

The deceased were identified as labourers Hariom Malviya (22), Ajay Malviya (20), Gopal Prajapati (45), Raja (22) and their contractor Pawan Panchal (35), Deputy Superintendent of Police (DSP) Umakant Chaudhary said.

Hariom and Ajay Malviya were brothers, he added.

"The roof slab which collapsed was constructed just one or two days ago," Chaudhary added.

The police officer said six cottages were being readied at the resort and their structures appeared weak at the first glance.

The department concerned will check the quality of construction work, Chaudhary added.

Madhya Pradesh Chief Minister Mohan Yadav expressed grief over the tragedy and announced financial assistance of Rs 2 lakh each to the family of the deceased.

Indore District Magistrate Ashish Singh said, "According to initial investigation a lawyer was getting the resort built." He said authorities were ascertaining if the owner took required permission from the village panchayat for the construction of the resort spread over an area of four acres.

A local resident, Sanjay Yadav, said the labourers and their contractor had taken shelter under the partially built cottage to escape from downpour and were asleep when the tragedy struck.

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