The injured were rescued and shifted to a private hospital where one of them is in a critical situation.
The building was under construction with labourers working in it at the time of the collapse.
The Hindu reported that the Bellandur Police reported to the call and is now aiding and supervising rescue operations.
While the ground and first floor of the building situated in Kasavanahalli near the IT hub of Sarjapur road caved in.
At least 15 construction are feared trapped under the building debris. More people are suspected to be trapped in the debris and the administration has started a rescue operation.
According to the Bengaluru Mayor, a five-storey building was constructed but the permission for only three had been granted.
Police and State Disaster Relief Force personnel are on the site rescuing those trapped. Officials of the National Disaster Force are also expected to reach the spot shortly. The building was under construction from last six years. In another incident from Bengaluru, seven people were killed when a two-storey building collapsed in the congested bylanes of Ejipura.
At least four were killed and eleven others injured after a five-storey under construction building collapsed in Bengaluru's Kasavanahalli region on Thursday.