Do I have to pay for damage that I didn't cause?

Question Details: About 2 months ago, my car slid on ice and collided with a guardrail, I was only going about 5-10 mph by the time I hit it and I only scratched my car no damage was done to the rail. Since no damage was done I started to drive away to get off the freeway to avoid being hit by other cars I saw losing control in the snow and about a mile away a police officer stopped to ask what happened and gave me a red tag saying I did the right thing and didn't do a hit and run basically. Fast forward to now I got a letter stating I owe $400 for damage. When I called to see what damage was supposedly done they said another car collided in the same spot later that night knocking down three posts and they didn't know who caused what damage so they split the bill between us. I didn't do any damage so I don't think that I should pay and if the officer had asked me to show him where I collided and assessed the scene he would know that but since he didnt theyre unsure of who caused it. Can I get out of this?

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