Settings: First battle; Stret of Verona vs Petrol Station

In the film we can saw that the first fight betwen capulets and montagues is in a Petrol station and the Police don't stop the battle.
But in the book we saw that the fight is in Verona's streets and the Prince stop it.
Another part is that the arms are not the same, in the book they have swords but in the film they have guns.
In the book there are not any explosions and fire and the fighters are the servents of the two families, Tybalt and Benvolio don't appear but in the film the Petrol station explodes ,Tybalt and Benvolio appear.