NEW DELHI — Police in southern India detained five construction company officials Sunday as rescuers using gas cutters and shovels searched for dozens of workers believed buried in the rubble of a building that collapsed during monsoon rains. It was one of two weekend building collapses that killed at least 26 people.

Nearly 90 contract workers were believed to have been in the basement of the 11-story structure to collect their wages when it collapsed Saturday on the outskirts of Chennai, the capital of Tamil Nadu state.

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Rescuers use a sniffer dog on Sunday to search for workers believed to be still buried in the rubble of a building that collapsed late Saturday during monsoon rains in the outskirts of Chennai, India. Officials said dozens of workers have been pulled out so far and the search is continuing. The Associated Press

Police said eight died on the spot and another seven succumbed to injuries in a hospital. Another 20 people have been pulled out alive.

J. Jayalalitha, the state’s top elected official, visited the site on Sunday and said another 40 people may still be trapped under the debris, according to the Press Trust of India news agency.

Rescuers could hear feeble voices in the debris, said T.S. Sridhar, the disaster management agency commissioner. Officials used gas cutters, iron rods and shovels after cranes lifted concrete blocks to get to the survivors.

“Removing debris is a major challenge. It may take two to three days to clear the rubble,” said S.P. Selvam, who is heading the rescue operation.

Moderate to heavy rains hampered rescue efforts later Sunday, but these were continuing, said police officer Pushpraj, who uses one name.

George Fernandes, another police officer, said two directors, two engineers and one supervisor of the construction company, Prime Sristi, were detained for questioning as authorities began investigating the collapse.

Balaguru, one of the builders, said the structure collapsed possibly due to the impact of lightning.

“Usually, once the construction gets over we install the equipment to prevent the building from a thunder strike. It was nearing completion,” the Press Trust of India news agency quoted Balaguru, who uses one name, as saying.

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