But once the vehicle approached , Drega began firing again , forcing the officers to take cover .
After the gunfire died down , agents moved a police vehicle to the scene in an attempt to evacuate Pfeifer before he bled to death .
Once the vehicle approached , Drega began firing again , forcing the officers to take cover .
After the gunfire died down , agents moved a police vehicle to the scene in an attempt to evacuate Pfeifer before he bled to death .