US Diplomat in Pakistan shoots two, claims self-defense

From the BBC:

An American diplomat in the Pakistani city of Lahore has shot and killed a Pakistani motorcycle rider and his pillion passenger, police say.

They say that the consular official fired his pistol in self-defence. US embassy officials confirmed that an American was involved.
The men were pursuing the American in his car when the incident happened.
[…]
Weapons were recovered from the bodies of the dead men.

I’m sure that this is going to do wonders for US-Pakistan relations.
Even if the shooting turns out to be perfectly justifiable and legal, there’s going to be a lot of drama.