Arrest them? They were in freaking Pakistan. Why would you arrest them? You guys are going crazy. Don't be surprised when you travel and realize the world hates you.
Share information about terrorism suspects, arrest them, bring them to justice. Don't go all Rambo, shooting first, asking questions later. That only perpetuates terrorism - "you killed my innocent parents, I'm shall take my revenge" - and the circle of violence continues.
(Plus, it's already been proven that anyone shot is marked as an "Enemy Killed in Action" posthumously, just to cover the perpetrators asses.)