A 15-year-old boy has been arrested after 12 double-decker buses were damaged in a fire that sent plumes of smoke across London.
About 50 firefighters tackled the blaze, which is being investigated, at the Westbourne Park Bus Garage in west London, on Sunday.
Three vehicles originally caught fire but explosions caused it to spread.
Scotland Yard said the youth was arrested near the scene and later bailed until 9 February.
The fire led to the Great Western Road, the A40 and Westbourne Park Tube station being shut for several hours.
A spokesman for bus company First confirmed the fire was estimated to have caused hundreds of thousands of pounds of damage.
He said: "It looks like seven buses have been burned out and three to four are smoke damaged."
The spokesman added it was a "complete mystery" as to how the blaze had begun, but confirmed there had been no casualties. It was brought under control at about 1215 GMT on Sunday.
He said the incident had happened in an outside area, where the buses had been parked overnight.
Services would not be affected, the spokesman said.