"Are there pok marks over some of the lining where the fire bottle is ( which also seems to be dintted ) ? Plus some of the struts seem to be hit by something ? The door that has holes in it , is that a rear door ? If a bomb was placed on board could there been more than one ?"
Yes.
Go to the original image and double the size. Increase brightness and contrast, and the marks are more visible. NOT normal wear and tear, esp the dents on the fire bottle.