One person was killed and at least four others are feared trapped under the rubble after a five-storey under construction building collapsed on Wednesday near Bellandur here, officials said.
One body has been recovered so far, officials said, as the rescue operations carried out by the State Disaster Response Force are underway.
"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.
Stating that one entire floor was constructed in an unauthorised manner, she said "strict and merciless action will be taken against the owner, architect and Bruhat Bengaluru Mahanagara Palike officials involved".