The incident, which occurred at Mina Towers on Kirongothi Street a few days ago, has instilled fear among residents.
Security authorities have expressed concern that the video has tarnished the reputation of both Kilifi police officers and the Administration canteen.
The ballistics experts found out that a spent cartridge recovered at the scene was fired from the Ceska pistol that was recovered from Osoro's home in Greenpark Estate.
On Monday, some youth were captured on CCTV camera robbing a man along the Haile Selassie Avenue in Mombasa
Forensic investigations established that Julius Osoro was at the scene where Adan Mohamed was attacked and his Sh4 million stolen.
A preliminary probe showed the criminal was attempting to break into a workshop when the deceased persons met their death.
The circumstances surrounding how the bodies of Kopo, Kibe, and Esther ended up in Nairobi County and who retrieved them from their initial location remain unclear.
The suspects will be in custody until April 22, when a court will rule on the DCI's application to hold them for 21 days.
The three are reported to have travelled to Mombasa to purchase a motor vehicle with the Sh3.9 million loot that was stolen from Adan at the time of the robbery, from where they were arrested.
The perpetrator immediately grabbed the cash, wrapped in green paper, and fled the scene, leaving Adan wounded and robbed.
The ongoing investigations seek to establish if the attack was just a mere robbery with violence case or could be a case of an illegal deal gone sour.
Three men suspected to be members of a criminal gang allegedly extorting money from PSV operators in Eastleigh, Nairobi, are now facing charges of robbery with violence.