Is it an act of war to attack an embassy?

simple question...Do the marines defending the embassy have to abide with some code or rules of engagement or do they simply extract the diplomats and kill anyone getting in the way of doing that?
Update: i put this in politics because of the ultimate political implications
Update 2: embassies ARE American soil...dipstick
Update 3: this last salvo directed to Martin xo
Update 4: so ypou all think that the Marines should just die happily and the politicians just make excuses
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