Incidents at Churchtown and Ballacrye
Wednesday evening's TT practice session has been cancelled after being red flagged.
Two incidents on the Mountain Course prompted officials to make the decision.
It was red flagged shortly after 6.30pm when there were reports a tree had caught fire in the Churchtown area of the course.
A second incident was also reported in the vicinity of Ballacrye.
The session was halted at around 7.20pm.
Organisers later released a statement which said a racer was involved in a collision with the course car, which was on its way to attending the situation at Churchtown.
The rider involved at Ballacrye has since been taken by airmed to Noble's Hospital for treatment.