My brother is travelling to Israel. He is 26. He travels on his own. How dangerous is Israel and do many Americans get killed there?

Update: We are not close to him but my Mom loves him. If he gets killed I don't know what will happen to her. He is travelling in early December and I'd hate to have the Christmas this year be wrecked by him having died either. I am worrying about it as a result.

How dangerous is it?
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