Who’s really to blame now?

I have an urgent question for you. This morning, the police suddenly stood in front of my door to come with me to the inspection. They explained to me that I was involved in an accident yesterday, but I didn’t notice anything. He read the files to me, it was supposed to have happened, I overtook a colone cars, lined up in front of AUTO A, because a truck came to meet me and then slowed down strongly, so that the AUTO A had the limp r me driving has had to introduce an emergency brake, since it would not have gone out with him without damaging my car he missed to the left, turned and the AUTO B behind him drove to him sideways. I myself did not notice anything of it that it was like that. it was only written down my kennel sign. Was surprised when the police stood at my door. The police now thinks that I am responsible for all the damage to both cars etc. Is this about 3000€?? What comes to me? Is the driver’s flight? Come from Austria and also happened in Austria.