Armed police officers in uniform and civilian clothes had taken charge and were screening everyone accessing the busy airport.
Other officers were strategically positioned at the airport and along the way as the time nears.
The Pope and his delegation are expected to land at 5pm where he will proceed to State House for a meeting with President Uhuru Kenyatta.
Kenyan authorities have since announced that over 10,000 police officers and 10,000 National Youth Service’s personnel will be mobilized for the event.
Major traffic changes, which are part of the security measures put in place to ensure the Pope is safe, will be effected as early as 4pm when President Kenyatta will be heading to the airport to receive him.
When he lands, the stretch of the road from the exit of JKIA all the way down through Mombasa Road, Haile Selassie Avenue, Kenyatta Avenue and State House Avenue to State House will be affected in the evening.
After the State House meeting, the Pope will head to the Nunciature. Again part of Uhuru Highway onto Waiyaki Way and James Gichuru Road will be affected.
On Thursday in the evening when the Pope will be going to the UNEP headquarters, Limuru Road all the way to UNEP headquarters will be affected, while on Friday the Pope will be headed to Kangemi area from his residence at the Nunciature in the morning.
Parking lots for vehicles that will not be able to access the venues have also been set aside and will be secured by armed police officers.