Remember when buses used to catch fire and we wouldn't immediately assume it was terrorists?
Ah, they were the good days weren't they? The days when everything was Transport for London's fault and spontaneous combustion had nothing to do with world politics and everything to do with bad engineering.
Anyway, suffice to say, the small fire on a London bus on Gray's Inn Road has caused the closure of several roads "but is not thought to be suspicious".
A cordon was erected around the Gray's Inn Road and Euston Road for about half an hour, and some passengers are said to have suffered some smoke inhalation, but that's about it.