Is that a promise or a threat? In Islam it's the same thing.

dailymail.co.uk
'The top Taliban commander in Pakistan has claimed responsibility for an attack on a police academy that left 18 dead after an eight-hour bloodbath.
And Baitullah Mehsud also promised an assault on Washington 'soon' - one he said will 'amaze' the world...

http://www.dailymail.co.uk/news/worldnews/article-1165758/Taliban-promises-attack-Washington-amaze-world-Pakistan-police-massacre.html