Looking into the details of the attack it looks really scandalous.
1- The bomb was attached to the trunk of the car !! The pictures show how the trunk is the only deformed part of the car...
2- The fire broke out because the gas tank got fire
3- No single shrapnel is obvious in the car. Indian police confirmed that the bomb has not shrapnel
So now, who on the earth plans such an attack ... attaching a bomb on the trunk to kill the driver ?