Here what touring plans is saying
A fire on a Disney Transportation bus earlier this evening, around 7:30 PM, shut down all bus traffic directly to and from the Magic Kingdoms main entrance. All guests had to travel via ferry or monorail from the Ticket and Transportation Center to the Magic Kingdom and vice versa.* The Ticket and Transportation Center made a rare attempt at actually being a transportation hub as it became the destination for all resort buses servicing the Magic Kingdom.
Studios touring-planners will note this incident and take a mental note that a flaming bus outside the Magic Kingdom means its time to get in line for the monorail or ferry before the standby line gets too long.
There have been no reports of injuries related to this incident.