>> The gunman who killed three Louisiana police officers was heavily armed, highly trained, and knew exactly what he was doing. I'm Andy Sullivan in Baton Rouge. Gavin Long had been in the city for several days, officials say, before he set out on Sunday morning to kill police officers.
>> It is the chilling and the sheer brutality of the shooting. There is no doubt what so ever, that these officers were intentionally targeted, and assassinated.>> He was driving towards the police headquarters, when he spotted a sheriffs deputy cruiser out in front of the gas station behind me.
He pulled over, got out a semi-automatic military style rifle, and crept up on the vehicle. He didn't find anybody inside, got back in his car and drove north to this car wash where he had spotted another police car. What followed was a deadly cat and mouse game between Long and the police officers who were responding to this scene.
He killed two of them in an alley behind a beauty supply salon and then hid behind a dumpster. When a Sheriff's deputy responded to help one of those officers, Long killed him as well. He then ran north back to the car wash and shot and wounded two more deputies before he was killed by a bullet from a police SWAT team.
Now Long war armed with two semiautomatic rifles and a nine millimeter pistol and officials say he was using military style tactics. For example, when he'd round the corner, he wouldn't cut it close, but he'd swing wide, so he'd have a greater range of fire. At this point, we know a lot about what happened on Sunday morning, but officials are just now beginning to investigate who he knew, where he drove, who he talked to, whether he knew people in town.
They're not giving up much at this moment because they say the investigation is just beginning and they don't want to compromise it. So, while we know a lot about what happened on Sunday morning, what happened before is still a big question mark.