question will remain once the dust settles and it will be some time yet has this regime changed and will it be enough to keep the country stable and the region? >> david cameron welcoming what's going on in egypt right now. the revolution has succeeded in egypt. it's now approaching 8:30. 8:22 p.m. in tahrir square right now. the celebration, i think it's fair to say at least on this night in cairo, elsewhere in egypt only just beginning. hala, it's a momentous occasion and i guess it's a cliche but history certainly is unfolding. >> absolutely and the celebration is just beginning and the process toward a true transition to democracy in egypt, if indeed that transition unfolds as protesters hope that it will is just beginning. frederik pleitgen is not too far from where the demonstrators are cheering. they're waving their flags. we saw small fireworks earlier over tahrir square. 18 days is the time that it took