At least 20 people are feared trapped under the debris of an under construction building that collapsed at Kodamtangal in Tamil Nadu on Thursday afternoon.
Police said no fatality had been reported yet, but condition of three injured, admitted to a government hospital, is reported to be serious.
A rescue operation by firefighters and police is on.
It was a school building that was under construction in the area close to Vellore that suddenly caved in when workers were doing molding work.
According to a private television channel, a few workers trapped inside the building were rescued. But more are feared trapped.
A crane was pressed into service to clear the debris.
Police have registered a case and investigation is on.