Atwoli claims that the government should strengthen laws to protect these workers.
The five who died include both adults and children.
The injured were rushed to the hospital.
Gachagua's residents were on Sunday night surrounded by authorities as they sought to apprehend him.
The governor has been a vocal critic of the government.
The former CJ was detained at Julius Nyerere International Airport.
On Sunday, Murkomen said 'no one is above the law', threatening to arrest Gachagua.
On Sunday, former Justice Minister Martha Karua was held for 6 hours before being deported from Tanzania.
There was outrage on Saturday over long queues and delays.
Kenya stands to reap potential benefits after Tanzania's Professor Mohamed Janabi was nominated as the next Regional Director for the World Health Organisation