Actually, aren't embassies considered the sovereign territory of the nation represented by that embassy? If so - and I'm pretty sure I am - this is an act of war fully warranting immediate military response by that nation. Of course, these savages won't believe that's true until we show them without a doubt that it is, in fact, true.
"The bombing begins in 5 minutes"
I think you are correct about the attacks on embassies being an act of war.
Got MOAB?