A 27-year-old man was killed when his car exploded while ...

A 27-year-old man was killed when his car exploded while driving on the highway. It is suspected that 150 grams of TNT were placed inside his car by unknown perpetrator(s). The police suspect that the incident was linked to the victim's criminal past. The police found a bulletproof vest, ammunition and a jar of cannabis in the victim's home, and the victim's pistol at the crime scene.