A six-storey building under construction has collapsed onto an adjacent building near the Indian capital, killing at least two people and trapping several others under the debris.
The Press Trust of India news agency quoted Chief Fire Officer Arun Kumar Singh saying at least 12 workers were in the building at the time and are feared trapped under rubble,
The rescuers have so far found two bodies from the debris, police said.
A second four-storey building also collapsed under the impact of the first building, but the fate of several of its residents was not immediately known.
More than 100 rescuers with cranes, sledgehammers and chain saws worked through the night to remove the debris in Shahberi village, nearly 40 km east of New Delhi, Krishan Kumar, a rescue agency official, said.Drills were being used to remove metal rods to reach those trapped. A dog squad was at the site smelling for signs of life.
The cause of the building collapse is not immediately known.
The National Disaster Response Force, a federal rescue agency, was helping police in the search and rescue operations.
Angry residents complained that the two buildings collapsed around 830 pm on Tuesday (0100 AEST) but the police and fire services reached the site an hour and a half later.
The rescue effort was slow to begin with, resident Praveen Srivastava told the NDTV news channel.
The police are looking for the builder for questioning.
Rescuers found it difficult to take cranes and drilling machines to the site where the ground was dug up in places during the construction work and had filled with water from monsoon rains.