Detectives on Wednesday morning raided the office of shadowy city businessman Mr Paul Kobia in Riverside, Kilimani in Nairobi.
The detectives arrived at the premises at 10am and broke the gate after workers failed to open.
Nairobi News has established that eight workers have been held so far.
Detectives have also denied journalists access to the premises.
The reason for the raid remains unclear although Mr Kobia has in the past paraded several firearms.
A source at the DCI has, however, told Nairobi News that detectives are seeking documents following a complaint by a foreigner who had been duped into a fake gold deal.
Detectives first visited the premises on Tuesday evening conducted a reconnaissance- which is an observation conducted on his home before they stroke on Wednesday.
They later struck on Wednesday morning.