A few years ago I saw a scifi movie about a group of travelers stranded at what I believe might have been a bus station (I don't remember that detail with any certainty). There were 2 children (a boy and a girl) who were running around and everyone thought they belonged to someone else there. As it turned out, the children were aliens that reverted to their true form and began hunting down the travelers. I've been searching all over the internet but can't come up with the name of the movie. Does anyone know the name of it?