Car Accident in Saudi Arabia

Dear Friends, Today I met an accident at Custodian of the two holy mosques Road, Khobar, Saudi Arabia near by Dhahran Techno Valley. The other "Car-1" is moving in front of me in middle lane and I am driving behind him with giving ambient stopping distance. Suddenly, "Car-2" entering my lane, it caused, the stopping distance becoming too short and also he hit the "Car 1" with giving sudden break. Because of short stopping distance and sudden break, I also hit the "Car-2" in his behind. Who's mistake it is? Who will get 100% mistake? Car-1 is Ford new car- only small dent. Car-2 very old Hyundai car - front and back injured. Car-3(My car - Toyota Yaris 2017 model) injured head light, front bumper and hood.