At 09.05hrs on Saturday, 3 August, police were called to a bus in collision with two children on Watling Street near the junction with Halcot Avenue, Bexleyheath.
A nine year-old girl was taken to hospital by ambulance. Her injuries are being treated as life-threatening.
The male driver of the bus was arrested. He has been taken into police custody where he remains.
[block_2]Any witnesses to the collision who are yet to speak with police are asked to call 101 quoting reference 2309/03Aug.