Indian police are investigating possible murder charges against 10 construction company employees who were either arrested or detained in connection with the collapse of an unfinished Kolkata overpass that killed at least 24 people.
Rescuers continued clearing rubble from the scene of Thursday's accident. Some 67 people have been pulled out alive, but rescuers doubted more survivors would be found.
"There is no possibility of finding any person alive," SS Guleria, deputy inspector general of the India's National Disaster Response Force said.
Three arrested employees of Hyderabad-based IVRCL Infrastructure were to appear on Saturday in court where arguments for formal charges would be heard.
Seven other employees have been detained, according to the Press Trust of India news agency. Police also sealed the company's Kolkata office.
The employees are being questioned over possible charges of murder and culpable homicide, crimes that are punishable by death or life imprisonment, and criminal breach of trust, which carries a prison sentence of up to seven years.
IVRCL Infrastructure was contracted in 2007 to build the overpass, a project expected to take two years. But construction was far behind schedule.
The overpass had spanned nearly the width of the street and was designed to ease traffic through the densely crowded Bara Bazaar neighbourhood. The structure fell within hours of concrete being poured into a framework of steel girders on Thursday.
"We completed nearly 70% of the construction work without any mishap," IVRCL official KP Rao said on Thursday. He was not among those detained on Friday.
"We have to go into the details to find out whether the collapse was due to any technical or quality issue."
Two West Bengal state engineers overseeing the construction of the overpass were suspended from jobs pending an inquiry into the disaster, the state government said.
Prime Minister Narendra Modi, who was in Washington at the time of the collapse, said he was "shocked and saddened" by the disaster.