What is this movie called?

it’s basically a cop movie. It starts off with a police unit accidentally gunning down a criminal who turns out to be a sibling of the town mafia or some other big shot. So the mafia goes after each of the cops responsible and kills em all. The last one left is the main hero who is rushing his family to safety when the mafia shows up and rams his car off the road with a huge truck. His family dies but he survives,so he goes back and avenges his family and police partners by killing mafia boss’s siblings the same way his family/friends were killed. In one scene he drives up to a car and tosses few grenades through the window killing the mafia member that way(this is how one of his police partners died)