Gunmen raided the Nairobi residence of billionaire-industrialist Manu Chandaria and robbed the family of Sh600,000 on Sunday night.
The gunmen also stole jewelry of unknown value in their Muthaiga residence.
Detectives from the Directorate of Criminal Investigations said the robbers managed to disarm an Administration Police officer of his G3 rifle.
Other guards on duty were found tied in a room as the gang escaped towards Karura forest.
It was not immediately established how the robbers accessed the Muthaiga residence which is located in one of the most affluent and expansive neighbourhoods in the city.
Detectives have launched investigations to establish whether it was a case of collusion or just a normal robbery.
Such attacks have not been common in the area where several prominent individuals including former President Mwai Kibaki, Mama Ngina Kenyatta and businessman Jimmy Wanjigi among others reside.