If you need more detailed spoilers than goldomark provided:
[sblock]
The beginning is a scene how drones are used to keep peace in Iran or Afghanistan, and a bunch of terrorists trying to kill the media team that's there. It basically makes a point on how effective - and terrifying - these machines are. Machines might get lost, terrorists get killed. Soldier(s*), Media crew, non-combatants - all fine.
Then there is a scene where Murphy and his partner get into a shoot-out while they are undercover trying to catch the "villain" of the story. His partner is injured, Murphy gets out okay. This is bascially the reason for the villain actively going after Murphy, realizing he won't stop, he can't be bought, and the cops the villain bought can't control him either.
*) not actually sure anymore if there is more than one - the "pacification" is very automated...
[/sblock]