According to witnesses, on Tuesday, at 2:00 p.m. local time, the pillars of a building under construction began to collapse and some workers were unable to get out on time despite shouts to clear the place.
Five persons were injured during the collapse and were taken to a nearby hospital.
Some other testimonies questioned that the infrastructure was impacted by the low quality of the materials used to raise the columns.
The local police commander, Anthony Mbogo, confirmed that an investigation has been launched in order to collect information about the number and identity, which is unknown so far, of people trapped in the debris.
In 2015, eight buildings collapsed in Kenya killing 15 persons, and according to an audit by the National Building Authority, 58 per cent of buildings in Nairobi were unfit to live in.
High demand for housing in the capital of Kenya means that some investors often evades regulations so building collapses are common, the investigation revealed.