It has shared warnings and a link to the registry on its Facebook page.
The fire, near Mill Road, Greeba on Saturday, was reported at about 3pm.
The group strives to put forward the case for the union.
Hickman and Dunlop end the week on four wins each
The senior gets underway at 12.15pm
Leaders Dunlop and Browne drop out with bike issues
The police have had separate reports of spectators entering course
This follows an earlier incident where two people were seen on the course near the Greg-ny-Baa
Hickman's 11th win overall at the TT
Pictures on social media showed the pair in the area of the Creg Ny Baa.
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