Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. A number 91 double-decker bus had its roof ripped off after hitting a tree, causing injury to passengers and passers-by, local media reported. (Photo by Peter Nicholls/Reuters)

A bus sits with its roof ripped off on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

An injured man is helped by a paramedic at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services work at the scene of a bus accident on the Kingsway in central London February 2, 2015. (Photo by Peter Nicholls/Reuters)

Emergency services arrive at the scene after five people were treated for minor injuries when a London bus had its roof ripped off in Kingsway, London, Monday, February 2, 2015. The roof of a 91 bus appeared to have been ripped off by overhanging trees. (Photo by Philip Toscano/AP Photo/PA Wire)