what happened , they bombed areas which had forces burried , and these forces were released when that war began , haven't you noticed the whole world have changed from the very entrance of America into the middle east?
Passage from the Qur'an;
But there is a ban on a town which We have destroyed: that they (the people of the town) shall not return. Until the Gog and Magog are let through (their barrier), and they spread out from every direction.(Qur'an 21:96–97)