An under-construction five-storey building collapsed near Bellandur in Bengaluru, killing one with four other people feared trapped under the rubble.
One body has been recovered so far, officials said adding that rescue operations were underway by the State Disaster Response Force.
"Four persons escaped, four are suspected trapped. One of them was rescued by our rescuers alive," Director General of Police, Fire and Emergency Services, M N Reddi said in a tweet.
Bengaluru Mayor G Padmavati visited the spot and said quality issues in the construction was the main reason for the mishap.
The Mayor said an entire floor was constructed in an unauthorised manner and that all guilty will be punished.
"Strict and merciless action will be taken against the owner, architect and Bruhat Bengaluru Mahanagara Palike officials involved," she said.
(With inputs from PTI)