The roof of a number 91 bus was on Monday ripped off after it hit overhanging trees in central London, near the London School of Economics (LSE) building, in Holborn.
According to he London Ambulance Service, two people were taken to hospital with facial injuries while two others were treated for minor injuries.
An LSE student Ethan Meade who witnessed the crash, said: “I saw the roof fall down off the side of the bus and the glass shatter everywhere.
“The passengers seemed to be sitting there pretty stunned, as you’d expect. Police seemed to handle it very well.”