I agree with Army Judge and I would add this: Responsibility is either determined by the parties and settled or by a judge. The only other "party" you have contacted that could be involved is not giving you information. It would seem that the other parties are waiting to see if you make the...
Fell in a Hole
Army Judge is Right On, Einstein!
The police report will be very important in order for your attorney to evaluate your position. It will be the "freshest", on the scene account of what you experienced as well as the officer's own witnessing of the environmental conditions...